Edit Profile (opens in new tab) Brzdęk, Janusz Compute Distance To: Compute Author ID: brzdek.janusz Published as: Brzdȩk, Janusz; Brzdęk, Janusz; Brzdȩk, J.; Brzdek, Janusz; Brzdęk, J.; Brzd{e}k, J. more...less Homepage: http://matematyka.up.krakow.pl/pracow.php?ac=7374149 External Links: dblp · GND Documents Indexed: 141 Publications since 1989, including 1 Book 7 Contributions as Editor Co-Authors: 48 Co-Authors with 94 Joint Publications 1,771 Co-Co-Authors all top 5 Co-Authors 54 single-authored 18 Xu, Bing 15 Ciepliński, Krzysztof 14 Popa, Dorian 12 Bahyrycz, Anna 10 Leśniak, Zbigniew 8 El-hady, El-sayed 7 Jabłońska, Eliza 7 Piszczek, Magdalena 6 Fošner, Ajda 5 Brillouët-Belluot, Nicole 5 Cădariu, Liviu I. 4 Chudziak, Jacek 4 Jung, Soon-Mo 3 Badora, Roman 3 Rassias, Themistocles Michael 3 Sikorska, Justyna 2 Batko, Bogdan 2 Benzarouala, Chaimaa 2 Eghbali, Nasrin 2 El-Fassi, Iz-Iddine 2 Förg-Rob, Wolfgang Johann Josef 2 Malejki, Renata 2 Moslehian, Mohammad Sal 2 Nassar, Hamed 2 Olko, Jolanta 2 Oubbi, Lahbib 2 Páles, Zsolt 2 Rasa, Ioan 2 Schwaiger, Jens 2 Stević, Stevo 1 Agarwal, Ravi P. 1 Chahbi, Abdellatif 1 Chmieliński, Jacek 1 Fechner, Włodzimierz 1 Ger, Roman 1 Grabiec, Artur 1 Kabbaj, Samir 1 Kalvandi, Vida 1 Karapınar, Erdal 1 Mureńko, Anna 1 Najdecki, Adam 1 Pacho, P. 1 Petruşel, Adrian 1 Pietrzyk, Andrzej 1 Tabor, Józef 1 Wójcik, Paweł 1 Zdun, Marek Cezary 1 Zhang, Weinian all top 5 Serials 22 Aequationes Mathematicae 12 Journal of Mathematical Analysis and Applications 8 Publicationes Mathematicae Debrecen 7 Bulletin of the Australian Mathematical Society 7 Acta Mathematica Hungarica 6 Journal of Fixed Point Theory and Applications 5 Nonlinear Analysis. Theory, Methods & Applications. Series A: Theory and Methods 5 Abstract and Applied Analysis 4 Results in Mathematics 4 Glasnik Matematički. Serija III 4 Journal of Function Spaces 3 Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg 3 Applied Mathematics and Computation 3 Archiv der Mathematik 3 Demonstratio Mathematica 2 Annales Polonici Mathematici 2 Pacific Journal of Mathematics 2 Applied Mathematics Letters 2 Discrete Dynamics in Nature and Society 2 Acta Mathematica Scientia. Series B. (English Edition) 2 Journal of Function Spaces and Applications 2 Fixed Point Theory 2 Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales. Serie A: Matemáticas. RACSAM 2 Springer Optimization and Its Applications 1 Computers & Mathematics with Applications 1 Zeszyty Naukowe Politechniki Śląskiej. Matematyka-Fizyka 1 Archivum Mathematicum 1 Manuscripta Mathematica 1 Proceedings of the American Mathematical Society 1 Semigroup Forum 1 Annales Universitatis Scientiarum Budapestinensis de Rolando Eötvös Nominatae. Sectio Computatorica 1 Prace Naukowe Uniwersytetu Śląskiego w Katowicach. Annales Mathematicae Silesianae 1 SIAM Review 1 Expositiones Mathematicae 1 Zeszyty Naukowe Akademii Górniczo-Hutniczej Im. Stanisława Staszica. Opuscula Mathematica 1 Filomat 1 Anzeiger. Abteilung II. Österreichische Akademie der Wissenschaften. Mathematisch-Naturwissenschaftliche Klasse 1 Journal of Difference Equations and Applications 1 Journal of Inequalities and Applications 1 Nonlinear Analysis. Real World Applications 1 Fixed Point Theory and Applications 1 Advances in Difference Equations 1 The Australian Journal of Mathematical Analysis and Applications 1 Carpathian Journal of Mathematics 1 Banach Center Publications 1 Banach Journal of Mathematical Analysis 1 Advances in the Theory of Nonlinear Analysis and its Applications 1 Mathematical Analysis and its Applications all top 5 Fields 138 Difference and functional equations (39-XX) 22 Operator theory (47-XX) 12 Functional analysis (46-XX) 9 Group theory and generalizations (20-XX) 9 General topology (54-XX) 7 General and overarching topics; collections (00-XX) 5 Topological groups, Lie groups (22-XX) 5 Ordinary differential equations (34-XX) 4 Real functions (26-XX) 3 Associative rings and algebras (16-XX) 3 Measure and integration (28-XX) 3 Probability theory and stochastic processes (60-XX) 2 Functions of a complex variable (30-XX) 2 Integral equations (45-XX) 2 Numerical analysis (65-XX) 1 Combinatorics (05-XX) 1 Number theory (11-XX) 1 Approximations and expansions (41-XX) 1 Convex and discrete geometry (52-XX) 1 Differential geometry (53-XX) Publications by Year all cited Publications top 5 cited Publications Citations contained in zbMATH Open 125 Publications have been cited 1,692 times in 576 Documents Cited by ▼ Year ▼ A fixed point approach to stability of functional equations. Zbl 1236.39022Brzdęk, Janusz; Chudziak, Jacek; Páles, Zsolt 124 2011 A fixed point approach to the stability of functional equations in non-Archimedean metric spaces. Zbl 1237.39022Brzdȩk, Janusz; Ciepliński, Krzysztof 97 2011 On some recent developments in Ulam’s type stability. Zbl 1259.39019Brillouët-Belluot, Nicole; Brzdȩk, Janusz; Ciepliński, Krzysztof 96 2012 Hyperstability of the Cauchy equation on restricted domains. Zbl 1313.39037Brzdęk, Janusz 75 2013 Hyperstability and superstability. Zbl 1293.39013Brzdȩk, Janusz; Ciepliński, Krzysztof 56 2013 Recent developments of the conditional stability of the homomorphism equation. Zbl 1312.39031Brzdęk, Janusz; Fechner, Włodzimierz; Moslehian, Mohammad Sal; Sikorska, Justyna 54 2015 Ulam stability of operators. Zbl 1393.39001Brzdęk, Janusz; Popa, Dorian; Raşa, Ioan; Xu, Bing 54 2018 A hyperstability result for the Cauchy equation. Zbl 1290.39016Brzdęk, Janusz 41 2014 Remarks on hyperstability of the Cauchy functional equation. Zbl 1303.39016Brzdȩk, Janusz 38 2013 The Gołąb-Schinzel equation and its generalizations. Zbl 1078.39021Brzdȩk, Janusz 38 2005 Fixed point theory and the Ulam stability. Zbl 1314.39029Brzdȩk, Janusz; Cădariu, Liviu; Ciepliński, Krzysztof 37 2014 On a method of proving the Hyers-Ulam stability of functional equations on restricted domains. Zbl 1175.39014Brzdȩk, Janusz 33 2009 Note on nonstability of the linear recurrence. Zbl 1126.39019Brzdęk, J.; Popa, D.; Xu, B. 32 2006 The Hyers-Ulam stability of nonlinear recurrences. Zbl 1123.39022Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 32 2007 On the quotient stability of a family of functional equations. Zbl 1172.39032Brzdęk, Janusz 30 2009 Remarks on stability of linear recurrence of higher order. Zbl 1206.39019Brzdęk, Janusz; Popa, Dorian; Xu, Bing 28 2010 Stability of the equation of the \(p\)-Wright affine functions. Zbl 1272.39015Brzdęk, Janusz 26 2013 A conditional exponential functional equation and its stability. Zbl 1187.39032Brzdȩk, Janusz; Sikorska, Justyna 25 2010 On nonstability of the linear recurrence of order one. Zbl 1193.39006Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 25 2010 Stability of additivity and fixed point methods. Zbl 1297.39026Brzdęk, Janusz 25 2013 A note on stability of the general linear equation. Zbl 1149.39018Brzdȩk, Janusz; Pietrzyk, Andrzej 24 2008 Hyers-Ulam stability for linear equations of higher orders. Zbl 1174.39012Brzdȩk, J.; Popa, D.; Xu, B. 23 2008 Remarks on stability of some inhomogeneous functional equations. Zbl 1316.39011Brzdęk, Janusz 23 2015 Subgroups of the group \(Z_ n\) and a generalization of the Gołąb- Schinzel functional equation. Zbl 0757.39003Brzdȩk, Janusz 21 1992 Fixed-point results and the Hyers-Ulam stability of linear equations of higher orders. Zbl 1319.39018Xu, Bing; Brzdęk, Janusz; Zhang, Weinian 21 2015 On solutions of the d’Alembert equation on a restricted domain. Zbl 1277.39036Bahyrycz, Anna; Brzdȩk, Janusz 20 2013 On a fixed point theorem in 2-Banach spaces and some of its applications. Zbl 1399.39063Brzdȩk, Janusz; Ciepliński, Krzysztof 18 2018 Selections of set-valued maps satisfying a linear inclusion in a single variable. Zbl 1205.39025Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 18 2011 A fixed point theorem and the Ulam stability in generalized dq-metric spaces. Zbl 1402.54037Brzdęk, Janusz; Karapınar, Erdal; Petruşel, Adrian 17 2018 On Ulam’s type stability of the linear equation and related issues. Zbl 1419.39053Brzdęk, Janusz; Ciepliński, Krzysztof; Leśniak, Zbigniew 17 2014 On approximate solutions of some delayed fractional differential equations. Zbl 1381.34103Brzdȩk, Janusz; Eghbali, Nasrin 14 2016 Hyers-Ulam stability with respect to gauges. Zbl 1404.34016Brzdęk, Janusz; Popa, Dorian; Raşa, Ioan 14 2017 A fixed point theorem in \(n\)-Banach spaces and Ulam stability. Zbl 1441.39025Brzdęk, Janusz; Ciepliński, Krzysztof 13 2019 On a conditional Gołab-Schinzel equation. Zbl 1075.39028Brzdek, Janusz; Mureńko, Anna 13 2005 A note on stability of a linear functional equation of second order connected with the Fibonacci numbers and Lucas sequences. Zbl 1198.39036Brzdȩk, Janusz; Jung, Soon-Mo 13 2010 On approximate solutions of the linear functional equation of higher order. Zbl 1204.65147Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 13 2011 On approximately \(p\)-Wright affine functions in ultrametric spaces. Zbl 1287.39016Bahyrycz, Anna; Brzdȩk, Janusz; Piszczek, Magdalena 13 2013 On approximate solutions of some difference equations. Zbl 1379.39003Brzdęk, Janusz; Wójcik, Paweł 13 2017 Hyperstability of the Fréchet equation and a characterization of inner product spaces. Zbl 1287.39017Bahyrycz, Anna; Brzdȩk, Janusz; Piszczek, Magdalena; Sikorska, Justyna 12 2013 A fixed point theorem and the Hyers-Ulam stability in non-Archimedean spaces. Zbl 1286.47049Brzdȩk, Janusz; Ciepliński, Krzysztof 12 2013 On hyperstability of the biadditive functional equation. Zbl 1399.39066El-Fassi, Iz-Iddine; Brzdek, Janusz; Chahbi, Abdellatif; Kabbaj, Samir 11 2017 A note on stability of an operator linear equation of the second order. Zbl 1273.39023Brzdȩk, Janusz; Jung, Soon-Mo 11 2011 Hyers-Ulam stability of the delay equation \(y'(t)=\lambda y(t-\tau )\). Zbl 1210.34108Jung, Soon-Mo; Brzdȩk, Janusz 11 2010 On stability of a family of functional equations. Zbl 1274.39052Brzdȩk, J. 11 2010 Remarks on the stability of Lie homomorphisms. Zbl 1280.39016Brzdȩk, Janusz; Fošner, Ajda 11 2013 Remarks on solutions to the functional equations of the radical type. Zbl 1412.39024Brzdȩk, Janusz 11 2017 Bounded solutions of the Gołab-Schinzel equation. Zbl 0961.39011Brzdȩk, Janusz 10 2000 Some remarks on solutions of the functional equation \(f(x+f(x)^ ny)=tf(x)f(y)\). Zbl 0808.39013Brzdȩk, Janusz 10 1993 A note on stability of additive mappings. Zbl 0844.39012Brzdȩk, Janusz 10 1994 A generalization of addition formulae. Zbl 1050.39031Brzdȩk, J. 10 2003 Remarks on the Hyers-Ulam stability of some systems of functional equations. Zbl 1311.39039Brzdęk, Janusz; Ciepliński, Krzysztof 10 2012 The Christensen measurable solutions of a generalization of the Gołąb-Schinzel functional equation. Zbl 0860.39034Brzdȩk, Janusz 8 1996 On orthogonally exponential and orthogonally additive mappings. Zbl 0870.39011Brzdek, Janusz 8 1997 On continuous solutions and stability of a conditional Gołąb-Schinzel equation. Zbl 1174.39011Brillouët-Belluot, Nicole; Brzdȩk, Janusz 8 2008 On orthogonally exponential functionals. Zbl 1010.39011Brzdȩk, Janusz 7 1997 The Cauchy and Jensen differences on semigroups. Zbl 0862.39011Brzdȩk, Janusz 7 1996 On functionals which are orthogonally additive modulo \(\mathbb{Z}\). Zbl 0862.39012Brzdȩk, Janusz 7 1996 On approximately additive functions. Zbl 1235.39017Brzdȩk, Janusz 7 2011 On continuous solutions of a class of conditional equations. Zbl 1212.39031Brillouët-Belluot, Nicole; Brzdȩk, Janusz; Chudziak, Jacek 7 2009 Ulam’s stability of a generalization of the Fréchet functional equation. Zbl 1339.39023Bahyrycz, Anna; Brzdęk, Janusz; Jabłońska, Eliza; Malejki, Renata 7 2016 A note on a fixed point theorem and the Hyers-Ulam stability. Zbl 1254.39012Badora, Roman; Brzdȩk, Janusz 7 2012 On the isosceles orthogonally exponential mappings. Zbl 0963.46015Brzdȩk, J. 7 2000 Fixed points of a mapping and Hyers-Ulam stability. Zbl 1311.39035Badora, Roman; Brzdȩk, Janusz 7 2014 A remark on solutions of a generalization of the addition formulae. Zbl 1094.39020Brzdȩk, Janusz 7 2006 Hyers-Ulam stability of a system of first order linear recurrences with constant coefficients. Zbl 1418.39027Xu, Bing; Brzdęk, Janusz 7 2015 On continuous solutions of a conditional Gołąb-Schinzel equation. Zbl 1045.39016Brzdȩk, J. 6 2001 On the continuous solutions of a generalization of the Gołąb-Schnizel equation. Zbl 1052.39023Brzdȩk, J. 6 2003 On approximate solutions of the generalized Volterra integral equation. Zbl 1295.45008Bahyrycz, Anna; Brzdȩk, Janusz; Leśniak, Zbigniew 6 2014 On functions that are approximate fixed points almost everywhere and Ulam’s type stability. Zbl 1328.39041Bahyrycz, Anna; Brzdęk, Janusz; Jabłońska, Eliza; Olko, Jolanta 6 2015 A note on solutions of a functional equation arising in a queuing model for a LAN gateway. Zbl 1345.30030Brzdęk, Janusz; El-hady, El-sayed; Förg-Rob, Wolfgang; Leśniak, Zbigniew 5 2016 On the Cauchy difference on normed spaces. Zbl 0864.39009Brzdȩk, J. 5 1996 On solutions of a generalization of the Reynolds functional equation. Zbl 1163.39013Brzdȩk, Janusz 5 2008 On the Baxter functional equation. Zbl 0857.39011Brzdȩk, Janusz 5 1996 A note on stability of the Popoviciu functional equation on restricted domain. Zbl 1221.39035Brzdęk, Janusz 5 2010 Remarks on solutions to a generalization of the radical functional equations. Zbl 1397.39016Brzdęk, Janusz; Schwaiger, Jens 5 2018 A fixed point theorem and the Hyers-Ulam stability in Riesz spaces. Zbl 1391.39031Batko, Bogdan; Brzdęk, Janusz 5 2013 Note on stability of the Cauchy equation - an answer to a problem of Th. M. Rassias. Zbl 1389.39047Brzdȩk, Janusz 5 2014 Selections of set-valued maps satisfying some inclusions and the Hyers-Ulam stability. Zbl 1311.39038Brzdȩk, Janusz; Piszczek, Magdalena 5 2014 On a generalization of the Cauchy functional equation. Zbl 0788.39004Brzdȩk, Janusz 4 1993 On the solutions of the functional equation \(f(xf(y)^ l + yf(x)^ k) = tf(x)f(y)\). Zbl 0741.39008Brzdȩk, Janusz 4 1991 On measurable orthogonally exponential functions. Zbl 0924.39018Brzdȩk, Janusz 4 1999 Remarks on stability and non-stability of the linear functional equation of the first order. Zbl 1334.39057Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 4 2014 Two general theorems on superstability of functional equations. Zbl 1322.39011Brzdȩk, Janusz; Najdecki, Adam; Xu, Bing 4 2015 A note on d’Alembert’s functional equation on a restricted domain. Zbl 1305.39016Bahyrycz, Anna; Brzdȩk, Janusz 4 2014 A note on stability of polynomial equations. Zbl 1277.39037Brzdȩk, Janusz; Stević, Stevo 4 2013 On the structure and solutions of functional equations arising from queueing models. Zbl 1441.39022El-Hady, El-Sayed; Brzdęk, Janusz; Nassar, Hamed 4 2017 Note on nonstability of the linear functional equation of higher order. Zbl 1231.39012Brzdek, Janusz; Popa, Dorian; Xu, Bing 4 2011 Fixed points of some nonlinear operators in spaces of multifunctions and the Ulam stability. Zbl 1417.39079Brzdȩk, Janusz; Piszczek, Magdalena 4 2017 On functions satisfying some inequalities. Zbl 0815.39011Brzdȩk, J. 3 1993 Survey on recent Ulam stability results concerning derivations. Zbl 1347.39025Brzdęk, Janusz; Cădariu, Liviu; Ciepliński, Krzysztof; Fošner, Ajda; Leśniak, Zbigniew 3 2016 On almost additive functions. Zbl 0865.39007Brzdȩk, Janusz 3 1996 Functional equations in mathematical analysis. Dedicated to the memory of Stanisław Marcin Ulam on the occasion of the 100th anniversary of his birth. Zbl 1225.39001 3 2011 On solutions of Aczél’s equation and some related equations. Zbl 1215.39023Brillouët-Belluot, Nicole; Brzdȩk, Janusz; Chudziak, Jacek 3 2010 On extensions of the generalized cosine functions from some large sets. Zbl 1399.39043Bahyrycz, A.; Brzdȩk, J.; Jabłońska, E. 3 2016 Stability for a family of equations generalizing the equation of \(p\)-Wright affine functions. Zbl 1410.39044Brzdęk, Janusz; Cădariu, Liviu 3 2016 Ulam type stability. Based on the conferences on Ulam type stability (CUTS), Cluj-Napoca, Romania, July 4–9, 2016 and Timisoara, Romania, October 8–13, 2018. Zbl 1431.39001 3 2019 On approximately additive mappings in 2-Banach spaces. Zbl 1440.39017Brzdęk, Janusz; El-Hady, El-Sayed 3 2020 On the generalized Fréchet functional equation with constant coefficients and its stability. Zbl 1390.39085Brzdęk, Janusz; Leśniak, Zbigniew; Malejki, Renata 2 2018 On the hyperstability of a pexiderised \(\sigma\)-quadratic functional equation on semigroups. Zbl 1387.39018El-Fassi, Iz-Iddine; Brzdęk, Janusz 2 2018 On the Cauchy difference. Zbl 0780.39008Brzdȩk, Janusz 2 1992 Banach limit in the stability problem of a linear functional equation. Zbl 1467.39019Badora, Roman; Brzdęk, Janusz 2 2021 On approximately additive mappings in 2-Banach spaces. Zbl 1440.39017Brzdęk, Janusz; El-Hady, El-Sayed 3 2020 Investigations on the Hyers-Ulam stability of generalized radical functional equations. Zbl 1441.39029Brzdęk, Janusz; El-hady, El-sayed; Schwaiger, Jens 1 2020 A fixed point theorem in \(n\)-Banach spaces and Ulam stability. Zbl 1441.39025Brzdęk, Janusz; Ciepliński, Krzysztof 13 2019 Ulam type stability. Based on the conferences on Ulam type stability (CUTS), Cluj-Napoca, Romania, July 4–9, 2016 and Timisoara, Romania, October 8–13, 2018. Zbl 1431.39001 3 2019 Ulam stability of operators. Zbl 1393.39001Brzdęk, Janusz; Popa, Dorian; Raşa, Ioan; Xu, Bing 54 2018 On a fixed point theorem in 2-Banach spaces and some of its applications. Zbl 1399.39063Brzdȩk, Janusz; Ciepliński, Krzysztof 18 2018 A fixed point theorem and the Ulam stability in generalized dq-metric spaces. Zbl 1402.54037Brzdęk, Janusz; Karapınar, Erdal; Petruşel, Adrian 17 2018 Remarks on solutions to a generalization of the radical functional equations. Zbl 1397.39016Brzdęk, Janusz; Schwaiger, Jens 5 2018 On the generalized Fréchet functional equation with constant coefficients and its stability. Zbl 1390.39085Brzdęk, Janusz; Leśniak, Zbigniew; Malejki, Renata 2 2018 On the hyperstability of a pexiderised \(\sigma\)-quadratic functional equation on semigroups. Zbl 1387.39018El-Fassi, Iz-Iddine; Brzdęk, Janusz 2 2018 Stability problem for the composite type functional equations. Zbl 1390.39095Agarwal, Ravi P.; Brzdęk, Janusz; Chudziak, Jacek 1 2018 Hyers-Ulam stability with respect to gauges. Zbl 1404.34016Brzdęk, Janusz; Popa, Dorian; Raşa, Ioan 14 2017 On approximate solutions of some difference equations. Zbl 1379.39003Brzdęk, Janusz; Wójcik, Paweł 13 2017 On hyperstability of the biadditive functional equation. Zbl 1399.39066El-Fassi, Iz-Iddine; Brzdek, Janusz; Chahbi, Abdellatif; Kabbaj, Samir 11 2017 Remarks on solutions to the functional equations of the radical type. Zbl 1412.39024Brzdȩk, Janusz 11 2017 On the structure and solutions of functional equations arising from queueing models. Zbl 1441.39022El-Hady, El-Sayed; Brzdęk, Janusz; Nassar, Hamed 4 2017 Fixed points of some nonlinear operators in spaces of multifunctions and the Ulam stability. Zbl 1417.39079Brzdȩk, Janusz; Piszczek, Magdalena 4 2017 Ulam stability of some functional inclusions for multi-valued mappings. Zbl 1499.39114Brzdęk, Janusz; Piszczek, Magdalena 1 2017 Developments in functional equations and related topics. Selected papers based on the presentations at the 16th international conference on functional equations and inequalities, ICFEI, Będlewo, Poland, May 17–23, 2015. Zbl 1381.39001 1 2017 Approximately \(p\)-Wright affine functions, inner product spaces and derivations. Zbl 1362.39033Bahyrycz, Anna; Brzdęk, Janusz; Piszczek, Magdalena 1 2017 On extensions of the generalised Jensen functions on semigroups. Zbl 1368.39018Brzdęk, Janusz; Jabłońska, Eliza 1 2017 On approximate solutions of some delayed fractional differential equations. Zbl 1381.34103Brzdȩk, Janusz; Eghbali, Nasrin 14 2016 Ulam’s stability of a generalization of the Fréchet functional equation. Zbl 1339.39023Bahyrycz, Anna; Brzdęk, Janusz; Jabłońska, Eliza; Malejki, Renata 7 2016 A note on solutions of a functional equation arising in a queuing model for a LAN gateway. Zbl 1345.30030Brzdęk, Janusz; El-hady, El-sayed; Förg-Rob, Wolfgang; Leśniak, Zbigniew 5 2016 Survey on recent Ulam stability results concerning derivations. Zbl 1347.39025Brzdęk, Janusz; Cădariu, Liviu; Ciepliński, Krzysztof; Fošner, Ajda; Leśniak, Zbigniew 3 2016 On extensions of the generalized cosine functions from some large sets. Zbl 1399.39043Bahyrycz, A.; Brzdȩk, J.; Jabłońska, E. 3 2016 Stability for a family of equations generalizing the equation of \(p\)-Wright affine functions. Zbl 1410.39044Brzdęk, Janusz; Cădariu, Liviu 3 2016 On stability of a functional equation of quadratic type. Zbl 1389.39046Brzd{e}k, J.; Jabłońska, E.; Moslehian, M. S.; Pacho, P. 2 2016 Remarks on solutions of a functional equation arising from an asymmetric switch. Zbl 1375.39042El-Hady, El-Sayed; Brzdęk, Janusz; Förg-Rob, Wolfgang; Nassar, Hamed 2 2016 Recent developments of the conditional stability of the homomorphism equation. Zbl 1312.39031Brzdęk, Janusz; Fechner, Włodzimierz; Moslehian, Mohammad Sal; Sikorska, Justyna 54 2015 Remarks on stability of some inhomogeneous functional equations. Zbl 1316.39011Brzdęk, Janusz 23 2015 Fixed-point results and the Hyers-Ulam stability of linear equations of higher orders. Zbl 1319.39018Xu, Bing; Brzdęk, Janusz; Zhang, Weinian 21 2015 Hyers-Ulam stability of a system of first order linear recurrences with constant coefficients. Zbl 1418.39027Xu, Bing; Brzdęk, Janusz 7 2015 On functions that are approximate fixed points almost everywhere and Ulam’s type stability. Zbl 1328.39041Bahyrycz, Anna; Brzdęk, Janusz; Jabłońska, Eliza; Olko, Jolanta 6 2015 Two general theorems on superstability of functional equations. Zbl 1322.39011Brzdȩk, Janusz; Najdecki, Adam; Xu, Bing 4 2015 On approximate generalized Lie derivations. Zbl 1321.47088Brzdęk, Janusz; Fošner, Ajda 2 2015 A hyperstability result for the Cauchy equation. Zbl 1290.39016Brzdęk, Janusz 41 2014 Fixed point theory and the Ulam stability. Zbl 1314.39029Brzdȩk, Janusz; Cădariu, Liviu; Ciepliński, Krzysztof 37 2014 On Ulam’s type stability of the linear equation and related issues. Zbl 1419.39053Brzdęk, Janusz; Ciepliński, Krzysztof; Leśniak, Zbigniew 17 2014 Fixed points of a mapping and Hyers-Ulam stability. Zbl 1311.39035Badora, Roman; Brzdȩk, Janusz 7 2014 On approximate solutions of the generalized Volterra integral equation. Zbl 1295.45008Bahyrycz, Anna; Brzdȩk, Janusz; Leśniak, Zbigniew 6 2014 Note on stability of the Cauchy equation - an answer to a problem of Th. M. Rassias. Zbl 1389.39047Brzdȩk, Janusz 5 2014 Selections of set-valued maps satisfying some inclusions and the Hyers-Ulam stability. Zbl 1311.39038Brzdȩk, Janusz; Piszczek, Magdalena 5 2014 Remarks on stability and non-stability of the linear functional equation of the first order. Zbl 1334.39057Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 4 2014 A note on d’Alembert’s functional equation on a restricted domain. Zbl 1305.39016Bahyrycz, Anna; Brzdȩk, Janusz 4 2014 On stability of the linear and polynomial functional equations in single variable. Zbl 1311.39037Brzdȩk, Janusz; Piszczek, Magdalena 2 2014 Remarks on stability of the equation of homomorphism for square symmetric groupoids. Zbl 1311.39036Bahyrycz, Anna; Brzdȩk, Janusz 1 2014 A note on the functions that are approximately \(p\)-Wright affine. Zbl 1319.39016Brzdȩk, Janusz 1 2014 Hyperstability of the Cauchy equation on restricted domains. Zbl 1313.39037Brzdęk, Janusz 75 2013 Hyperstability and superstability. Zbl 1293.39013Brzdȩk, Janusz; Ciepliński, Krzysztof 56 2013 Remarks on hyperstability of the Cauchy functional equation. Zbl 1303.39016Brzdȩk, Janusz 38 2013 Stability of the equation of the \(p\)-Wright affine functions. Zbl 1272.39015Brzdęk, Janusz 26 2013 Stability of additivity and fixed point methods. Zbl 1297.39026Brzdęk, Janusz 25 2013 On solutions of the d’Alembert equation on a restricted domain. Zbl 1277.39036Bahyrycz, Anna; Brzdȩk, Janusz 20 2013 On approximately \(p\)-Wright affine functions in ultrametric spaces. Zbl 1287.39016Bahyrycz, Anna; Brzdȩk, Janusz; Piszczek, Magdalena 13 2013 Hyperstability of the Fréchet equation and a characterization of inner product spaces. Zbl 1287.39017Bahyrycz, Anna; Brzdȩk, Janusz; Piszczek, Magdalena; Sikorska, Justyna 12 2013 A fixed point theorem and the Hyers-Ulam stability in non-Archimedean spaces. Zbl 1286.47049Brzdȩk, Janusz; Ciepliński, Krzysztof 12 2013 Remarks on the stability of Lie homomorphisms. Zbl 1280.39016Brzdȩk, Janusz; Fošner, Ajda 11 2013 A fixed point theorem and the Hyers-Ulam stability in Riesz spaces. Zbl 1391.39031Batko, Bogdan; Brzdęk, Janusz 5 2013 A note on stability of polynomial equations. Zbl 1277.39037Brzdȩk, Janusz; Stević, Stevo 4 2013 Remarks on some systems of two simultaneous functional inequalities. Zbl 1289.39051Bahyrycz, Anna; Brzdȩk, Janusz 1 2013 Ulam’s type stability 2013. Zbl 1298.00108 1 2013 On some recent developments in Ulam’s type stability. Zbl 1259.39019Brillouët-Belluot, Nicole; Brzdȩk, Janusz; Ciepliński, Krzysztof 96 2012 Remarks on the Hyers-Ulam stability of some systems of functional equations. Zbl 1311.39039Brzdęk, Janusz; Ciepliński, Krzysztof 10 2012 A note on a fixed point theorem and the Hyers-Ulam stability. Zbl 1254.39012Badora, Roman; Brzdȩk, Janusz 7 2012 Remarks on stability of the linear functional equation in single variable. Zbl 1248.39022Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 1 2012 A note on stability of the linear functional equations of higher order and fixed points of an operators. Zbl 1282.39026Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 1 2012 A fixed point approach to stability of functional equations. Zbl 1236.39022Brzdęk, Janusz; Chudziak, Jacek; Páles, Zsolt 124 2011 A fixed point approach to the stability of functional equations in non-Archimedean metric spaces. Zbl 1237.39022Brzdȩk, Janusz; Ciepliński, Krzysztof 97 2011 Selections of set-valued maps satisfying a linear inclusion in a single variable. Zbl 1205.39025Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 18 2011 On approximate solutions of the linear functional equation of higher order. Zbl 1204.65147Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 13 2011 A note on stability of an operator linear equation of the second order. Zbl 1273.39023Brzdȩk, Janusz; Jung, Soon-Mo 11 2011 On approximately additive functions. Zbl 1235.39017Brzdȩk, Janusz 7 2011 Note on nonstability of the linear functional equation of higher order. Zbl 1231.39012Brzdek, Janusz; Popa, Dorian; Xu, Bing 4 2011 Functional equations in mathematical analysis. Dedicated to the memory of Stanisław Marcin Ulam on the occasion of the 100th anniversary of his birth. Zbl 1225.39001 3 2011 Remarks on stability of linear recurrence of higher order. Zbl 1206.39019Brzdęk, Janusz; Popa, Dorian; Xu, Bing 28 2010 A conditional exponential functional equation and its stability. Zbl 1187.39032Brzdȩk, Janusz; Sikorska, Justyna 25 2010 On nonstability of the linear recurrence of order one. Zbl 1193.39006Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 25 2010 A note on stability of a linear functional equation of second order connected with the Fibonacci numbers and Lucas sequences. Zbl 1198.39036Brzdȩk, Janusz; Jung, Soon-Mo 13 2010 Hyers-Ulam stability of the delay equation \(y'(t)=\lambda y(t-\tau )\). Zbl 1210.34108Jung, Soon-Mo; Brzdȩk, Janusz 11 2010 On stability of a family of functional equations. Zbl 1274.39052Brzdȩk, J. 11 2010 A note on stability of the Popoviciu functional equation on restricted domain. Zbl 1221.39035Brzdęk, Janusz 5 2010 On solutions of Aczél’s equation and some related equations. Zbl 1215.39023Brillouët-Belluot, Nicole; Brzdȩk, Janusz; Chudziak, Jacek 3 2010 On a method of proving the Hyers-Ulam stability of functional equations on restricted domains. Zbl 1175.39014Brzdȩk, Janusz 33 2009 On the quotient stability of a family of functional equations. Zbl 1172.39032Brzdęk, Janusz 30 2009 On continuous solutions of a class of conditional equations. Zbl 1212.39031Brillouët-Belluot, Nicole; Brzdȩk, Janusz; Chudziak, Jacek 7 2009 A note on stability of the general linear equation. Zbl 1149.39018Brzdȩk, Janusz; Pietrzyk, Andrzej 24 2008 Hyers-Ulam stability for linear equations of higher orders. Zbl 1174.39012Brzdȩk, J.; Popa, D.; Xu, B. 23 2008 On continuous solutions and stability of a conditional Gołąb-Schinzel equation. Zbl 1174.39011Brillouët-Belluot, Nicole; Brzdȩk, Janusz 8 2008 On solutions of a generalization of the Reynolds functional equation. Zbl 1163.39013Brzdȩk, Janusz 5 2008 Continuity of measurable homomorphisms. Zbl 1157.22001Brzdȩk, Janusz 2 2008 The Hyers-Ulam stability of nonlinear recurrences. Zbl 1123.39022Brzdȩk, Janusz; Popa, Dorian; Xu, Bing 32 2007 On approximately microperiodic mappings. Zbl 1164.39012Brzdȩk, J. 2 2007 Note on nonstability of the linear recurrence. Zbl 1126.39019Brzdęk, J.; Popa, D.; Xu, B. 32 2006 A remark on solutions of a generalization of the addition formulae. Zbl 1094.39020Brzdȩk, Janusz 7 2006 Generalizations of some results concerning microperiodic mappings. Zbl 1194.39021Brzdęk, Janusz 2 2006 The Gołąb-Schinzel equation and its generalizations. Zbl 1078.39021Brzdȩk, Janusz 38 2005 On a conditional Gołab-Schinzel equation. Zbl 1075.39028Brzdek, Janusz; Mureńko, Anna 13 2005 Stability of the Cauchy congruence on restricted domain. Zbl 1059.39018Brzdȩk, Janusz; Tabor, Józef 2 2004 ...and 25 more Documents all cited Publications top 5 cited Publications all top 5 Cited by 468 Authors 75 Brzdęk, Janusz 27 Jung, Soon-Mo 26 El-Fassi, Iz-Iddine 26 Popa, Dorian 22 Ciepliński, Krzysztof 22 Park, Choonkil 20 Kabbaj, Samir 19 Bahyrycz, Anna 18 Bodaghi, Abasalt 17 Chudziak, Jacek 17 Rassias, John Michael 16 Chung, Jaeyoung 16 Jabłońska, Eliza 15 Almahalebi, Muaadh 15 Onitsuka, Masakazu 14 Rassias, Themistocles Michael 13 Khodaei, Hamid 13 Zada, Akbar 12 El-hady, El-sayed 11 Anderson, Douglas Robert 10 Olko, Jolanta 10 Ostaszewski, Adam J. 10 Piszczek, Magdalena 10 Sintunavarat, Wutiphol 10 Xu, Tianzhou 9 Saadati, Reza 9 Sikorska, Justyna 9 Xu, Bing 8 Eshaghi Gordji, Madjid 8 Lee, Yang-Hi 8 Leśniak, Zbigniew 8 Rezapour, Shahram 7 Aiemsomboon, Laddawan 7 Choi, Chang-Kwon 7 Dragičević, Davor 7 Fošner, Ajda 7 Rasa, Ioan 6 Aribou, Youssef 6 Baias, Alina-Ramona 6 Li, Yongjin 6 O’Regan, Donal 5 Al-Ali, Sadeq A. A. 5 Buşe, Constantin 5 Cădariu, Liviu I. 5 Charifi, Ahmed 5 Dăianu, Dan M. 5 Hryrou, Mustapha Esseghyr 5 Karapınar, Erdal 5 Kaskasem, Prondanai 5 Kumar, D. Ramesh 5 Nuino, Ahmed 5 Oubbi, Lahbib 5 Pitchaimani, M. 5 Schwaiger, Jens 5 Wang, Jinrong 4 Benzarouala, Chaimaa 4 Bingham, Nicholas Hugh 4 Brillouët-Belluot, Nicole 4 Chahbi, Abdellatif 4 Dong, Yunbai 4 El Ghali, Rachid 4 Etemad, Sina 4 Klin-Eam, Chakkrid 4 Malejki, Renata 4 Nam, Young Woo 4 Rassias, Michael Th. 4 Roh, Jaiok 4 Shah, Kamal 4 Stević, Stevo 4 Wang, Zhihua 3 Alzabut, Jehad O. 3 Backes, Lucas H. 3 Badora, Roman 3 Batko, Bogdan 3 Bouikhalene, Belaid 3 Chang, Ick-Soon 3 Cho, Yeol Je 3 de la Sen, Manuel 3 Dimou, Hajira 3 Ding, Yali 3 Dutta, Hemen 3 Elkettani, Youssfi 3 Fechner, Włodzimierz 3 Hayati, Bahman 3 Kang, DongSeung 3 Kim, Gwang Hui 3 Kim, Hark-Mahn 3 Kočan, Zdeněk 3 Lee, Bogeun 3 Lee, Jung-Rye 3 Lungu, Nicolaie 3 Mîndruţă, Cristina 3 Mirzaee, Farshid 3 Moslehian, Mohammad Sal 3 Saejung, Satit 3 Saierli, Olivia 3 Shin, Dong-Yun 3 Szczawińska, Joanna 3 Wu, Jianrong 2 Ali, Wajid ...and 368 more Authors all top 5 Cited in 124 Serials 64 Aequationes Mathematicae 39 Journal of Mathematical Analysis and Applications 28 Journal of Fixed Point Theory and Applications 26 Journal of Inequalities and Applications 25 Journal of Function Spaces 24 Results in Mathematics 24 Abstract and Applied Analysis 23 Advances in Difference Equations 20 Acta Mathematica Hungarica 18 Bulletin of the Australian Mathematical Society 15 Applied Mathematics and Computation 13 Applied Mathematics Letters 9 Proyecciones 8 Nonlinear Analysis. 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Commentarii Mathematici 1 Fundamenta Mathematicae 1 Journal of Computational and Applied Mathematics 1 Manuscripta Mathematica 1 Mathematica Slovaca 1 Proceedings of the American Mathematical Society 1 Publications de l’Institut Mathématique. Nouvelle Série 1 Quaestiones Mathematicae 1 Rendiconti del Circolo Matemàtico di Palermo. Serie II 1 Synthese 1 Bulletin of the Korean Mathematical Society 1 Bulletin of the Iranian Mathematical Society 1 Applied Numerical Mathematics 1 Journal of Global Optimization 1 Proceedings of the Royal Society of Edinburgh. Section A. Mathematics 1 Russian Journal of Mathematical Physics 1 Journal of the Egyptian Mathematical Society 1 Random Operators and Stochastic Equations 1 Arab Journal of Mathematical Sciences 1 Honam Mathematical Journal 1 Mathematical Inequalities & Applications 1 Acta Mathematica Sinica. English Series 1 Annales Mathematicae Silesianae 1 Qualitative Theory of Dynamical Systems 1 International Journal of Nonlinear Sciences and Numerical Simulation 1 Nonlinear Analysis. Real World Applications 1 Nonlinear Analysis. Modelling and Control 1 Nonlinear Functional Analysis and Applications 1 Kragujevac Journal of Mathematics 1 Applied Mathematics E-Notes 1 Journal of Applied Mathematics 1 Central European Journal of Mathematics 1 Quantum Information Processing 1 Iranian Journal of Fuzzy Systems ...and 24 more Serials all top 5 Cited in 43 Fields 456 Difference and functional equations (39-XX) 146 Operator theory (47-XX) 72 Ordinary differential equations (34-XX) 57 Functional analysis (46-XX) 44 General topology (54-XX) 33 Real functions (26-XX) 16 Numerical analysis (65-XX) 14 Integral equations (45-XX) 13 Partial differential equations (35-XX) 10 Approximations and expansions (41-XX) 6 Measure and integration (28-XX) 6 Dynamical systems and ergodic theory (37-XX) 6 Probability theory and stochastic processes (60-XX) 6 Systems theory; control (93-XX) 5 Associative rings and algebras (16-XX) 5 Nonassociative rings and algebras (17-XX) 5 Topological groups, Lie groups (22-XX) 4 Quantum theory (81-XX) 3 General and overarching topics; collections (00-XX) 3 Mathematical logic and foundations (03-XX) 3 Number theory (11-XX) 3 Group theory and generalizations (20-XX) 3 Functions of a complex variable (30-XX) 3 Special functions (33-XX) 3 Convex and discrete geometry (52-XX) 3 Biology and other natural sciences (92-XX) 2 Combinatorics (05-XX) 2 Field theory and polynomials (12-XX) 2 Harmonic analysis on Euclidean spaces (42-XX) 2 Abstract harmonic analysis (43-XX) 2 Integral transforms, operational calculus (44-XX) 2 Game theory, economics, finance, and other social and behavioral sciences (91-XX) 1 History and biography (01-XX) 1 Commutative algebra (13-XX) 1 Linear and multilinear algebra; matrix theory (15-XX) 1 Sequences, series, summability (40-XX) 1 Calculus of variations and optimal control; optimization (49-XX) 1 Algebraic topology (55-XX) 1 Global analysis, analysis on manifolds (58-XX) 1 Statistics (62-XX) 1 Mechanics of particles and systems (70-XX) 1 Operations research, mathematical programming (90-XX) 1 Information and communication theory, circuits (94-XX) Citations by Year