## Found 984 Documents (Results 1–100)

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### On restricted functional inequalities associated with quadratic functional equations. (English)Zbl 07558132

MSC:  39B62 39B82 39B72
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MSC:  39B52
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### Drygas functional inequality on restricted domains. (English)Zbl 07491529

MSC:  39B82 39B52 39B62
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### Solvability, stability, smoothness and compactness of the set of solutions for a nonlinear functional integral equation. (English)Zbl 07577635

MSC:  39B72 45F10 47N20
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### Characterization and stability analysis of advanced multi-quadratic functional equations. (English)Zbl 07575404

MSC:  39B82 39B22
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### Inner product spaces and quadratic functional equations. (English)Zbl 07575164

MSC:  39B52 39B82
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### Stability of complex functional equations in 2-Banach spaces. (English)Zbl 07552151

MSC:  39B82 39B52
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### Approximate mixed type quadratic-cubic functional equation. (English)Zbl 07543285

MSC:  39B82 39B72
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### Stability of generalized cube root functional (GCRFf) equations in random normed spaces. (English)Zbl 07540129

MSC:  39B72 39B82
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### Ulam stability of a functional equation deriving from quadratic and additive mappings in random normed spaces. (English)Zbl 1487.39035

MSC:  39B82 39B52 39B72
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### Multiplicative functions additive on polygonal numbers. (English)Zbl 1479.11023

MSC:  11A25 11E25
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### On the generalized Hyers-Ulam stability of a functional equation and its consequences. (English)Zbl 1468.39016

MSC:  39B82 47H10
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MSC:  39B52
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### A variant of d’Alembert’s matrix functional equation. (English)Zbl 1467.39017

MSC:  39B42 39B52
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### Alienation of Cauchy’s and the quadratic functional equations on semigroups. (English)Zbl 1470.39051

MSC:  39B52 39B72
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MSC:  39B82
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### Fuzzy approximations of a multiplicative inverse cubic functional equation. (English)Zbl 1491.39014

MSC:  39B52 39B82
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### On the solvability of a self-reference functional and quadratic functional integral equations. (English)Zbl 07539021

MSC:  32A55 47J35 45G10
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### Hyers-Ulam stability of a finite variable mixed type quadratic-additive functional equation in quasi-Banach spaces. (English)Zbl 1489.39036

MSC:  39B52 39B72 39B82
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### Stability of the general mixed additive and quadratic functional equation in quasi Banach spaces. (English)Zbl 1480.39022

MSC:  39B52 39B82
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### Stability of a generalization of Cauchy’s and the quadratic functional equations in quasi-Banach spaces. (English)Zbl 1480.39020

MSC:  39B52 39B82
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MSC:  39B82
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### Time-inconsistent stochastic LQ problem with regime switching. (English)Zbl 1460.93097

MSC:  93E03 93C30 39A50
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### Stability of special functional equations on Banach lattices. (English)Zbl 1454.47062

MSC:  39B82 39B72
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MSC:  39B22
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### On the existence of continuous positive monotonic solutions of a self-reference quadratic integral equation. (English)Zbl 1451.45002

MSC:  45G10 39B22
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### Stochastic optimal control of a descriptor system. (English. Russian original)Zbl 1454.93296

Cybern. Syst. Anal. 56, No. 2, 204-212 (2020); translation from Kibern. Sist. Anal. 2020, No. 2, 42-52 (2020).
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### D’Alembert’s matrix functional equation with an endomorphism on abelian groups. (English)Zbl 1451.39021

MSC:  39B42 39B52
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### Generalized Hyers-Ulam stability of some cubic-quadratic-additive type functional equations. (English)Zbl 1450.39018

MSC:  39B82 39B52
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### Ternary quadratic Pompeiu on ternary Banach algebras. (English)Zbl 1452.39009

MSC:  39B72 39B82 46H05
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### Solution to Kim-Rassias’s question on stability of generalized Euler-Lagrange quadratic functional equations in quasi-Banach spaces. (English)Zbl 1450.39020

MSC:  39B82 39B52 46A16
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MSC:  39B82
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MSC:  39B52
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### Alienation and the stability problem. (English)Zbl 1441.39028

MSC:  39B62 39B82 39B52
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### On set-valued solutions of a generalized bi-quadratic functional equation. (English)Zbl 1440.39009

MSC:  39B52 54C60
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### Measure zero stability problem of a generalized quadratic functional equation. (English)Zbl 1440.39018

MSC:  39B82 39B52
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MSC:  39B82 39B52
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### Existence of almost periodic solutions for fractional impulsive neutral stochastic differential equations with infinite delay. (English)Zbl 1442.34125

Reviewer: Syed Abbas (Mandi)
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### On extensions of the generalized quadratic functions from “large” subsets of semigroups. (English)Zbl 1455.39004

MSC:  39B52 20M14
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MSC:  39B82 39B52 54E52
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MSC:  39B52
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### Approximate solutions of a quadratic functional equation in 2-Banach spaces using fixed point theorem. (English)Zbl 1428.39033

MSC:  39B82 39B52 47H10
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### Fundamental stabilities of various forms of complex valued functional equations. (English)Zbl 1423.39037

Dutta, Hemen (ed.) et al., Applied mathematical analysis: theory, methods, and applications. Cham: Springer. Stud. Syst. Decis. Control 177, 29-59 (2020).
MSC:  39B82 39B72
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### Approximate solution of generalized inhomogeneous radical quadratic functional equations in 2-Banach spaces. (English)Zbl 07459059

MSC:  39Bxx 47Hxx 39-XX
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MSC:  39B82 39B52
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Anastassiou, George A. (ed.) et al., Frontiers in functional equations and analytic inequalities. Cham: Springer. 309-323 (2019).
MSC:  39B82 47H10
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### Solution of generalized Jensen and quadratic functional equations. (English)Zbl 1448.39039

Anastassiou, George A. (ed.) et al., Frontiers in functional equations and analytic inequalities. Cham: Springer. 273-292 (2019).
MSC:  39B52
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### Solutions and stability of some functional equations on semigroups. (English)Zbl 1447.39017

Brzdęk, Janusz (ed.) et al., 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. Cham: Springer. 167-198 (2019).
MSC:  39B82 39B52
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### On 2-adic behavior of the number of domino tilings on torus. (English)Zbl 1444.05038

MSC:  05B45 05A15 11A07
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### Control with point observation for a parabolic problem with convection. (English. Russian original)Zbl 1436.35221

Trans. Mosc. Math. Soc. 2019, 221-234 (2019); translation from Tr. Mosk. Mat. O.-va 80, No. 2, 259-274 (2019).
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### Stabilities of various multiplicative inverse functional equations. (English)Zbl 1437.39012

MSC:  39B82 39B52 39B72
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### A fixed point approach to the stability of a quadratic-cubic-quartic functional equation. (Korean. English summary)Zbl 1429.39023

MSC:  39B82 39B52
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### A movable optimal control problem with additional constraint for one heat process. (English)Zbl 1430.49022

MSC:  49K15 49K21

### On the stability of a general quadratic-cubic functional equation in non-Archimedean normed spaces. (English)Zbl 1427.39015

MSC:  39B82 39B22 39B52
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### A fixed point approach to the stability of a quadratic-cubic functional equation. (English)Zbl 1426.39027

MSC:  39B82 47H10
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### High-accuracy calculation of eigenvalues of the Laplacian in an ellipse (with Neumann boundary condition). (English. Russian original)Zbl 1428.65071

Dokl. Math. 99, No. 3, 260-262 (2019); translation from Dokl. Akad. Nauk, Ross. Akad. Nauk 486, No. 2, 143-146 (2019).
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### Generalized Hyers-Ulam stability of a quadratic-cubic functional equation in modular spaces. (English)Zbl 1423.39036

MSC:  39B82 39B52

### Stability of generalized multi-quadratic mappings in Lipschitz spaces. (English)Zbl 1420.39018

MSC:  39B52 39B82 39B72
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### Baire category theorem and approximation of the Pexider quadratic functional equation on a set of Lebesgue measure zero. (English)Zbl 1420.39022

MSC:  39B82 39B52
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### A system of functional equations satisfied by components of a quadratic function and its stability. (English)Zbl 1420.39021

MSC:  39B72 39B82
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### Classification of generalized ternary quadratic quasigroup functional equations of the length three. (English)Zbl 07103583

MSC:  20N15 39B52
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### Stability of functional equations and properties of groups. (English)Zbl 1425.39016

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MSC:  39B82 39B52
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### $$kn - 2$$ scalar matrix and its functional equations by mathematical modeling. (English)Zbl 1429.39015

Ruzhansky, Michael (ed.) et al., Advanced topics in mathematical analysis. Boca Raton, FL: CRC Press. 449-468 (2019).
MSC:  39B42 15A24 39B62

### Existence of positive solutions for a nonlinear quadratic integral equation. (English)Zbl 1476.45006

MSC:  45G10 45M20 34K37
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### Generalized forms of Swiatak’s functional equations with involution. (English)Zbl 1418.39023

MSC:  39B52 39B82
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### On approximation of approximately generalized quadratic functional equation via Lipschitz criteria. (English)Zbl 1415.39019

MSC:  39B52 39B82
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### Quadratic functions fulfilling an additional condition along hyperbolas or the unit circle. (English)Zbl 1414.39011

MSC:  39B22 39B55
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### On a quadratic difference assuming three values. (English)Zbl 1407.39011

MSC:  39B52 39B82
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### Non-Archimedean stability of a generalized reciprocal-quadratic functional equation in several variables by direct and fixed point methods. (English)Zbl 07475358

MSC:  39B82 39B72
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