Peng, Ru; Xing, Xiaolei; Jiang, Liangying Pointwise multiplication operators from Hardy spaces to weighted Bergman spaces in the unit ball of \(\mathbb{C}^n\). (English) Zbl 1499.32016 Acta Math. Sci., Ser. B, Engl. Ed. 39, No. 4, 1003-1016 (2019). MSC: 32A37 47B38 32A36 PDF BibTeX XML Cite \textit{R. Peng} et al., Acta Math. Sci., Ser. B, Engl. Ed. 39, No. 4, 1003--1016 (2019; Zbl 1499.32016) Full Text: DOI OpenURL
Bissar, Samira; Moussai, Madani Pointwise multiplication in the realized homogeneous Besov and Triebel-Lizorkin spaces. (English) Zbl 1433.46023 Probl. Anal. Issues Anal. 7(25), No. 1, 3-22 (2018). MSC: 46E35 PDF BibTeX XML Cite \textit{S. Bissar} and \textit{M. Moussai}, Probl. Anal. Issues Anal. 7(25), No. 1, 3--22 (2018; Zbl 1433.46023) Full Text: DOI MNR OpenURL
Nguyen, Van Kien; Sickel, Winfried Pointwise multipliers for Besov spaces of dominating mixed smoothness. II. (English) Zbl 1402.46027 Sci. China, Math. 60, No. 11, 2241-2262 (2017). MSC: 46E35 PDF BibTeX XML Cite \textit{V. K. Nguyen} and \textit{W. Sickel}, Sci. China, Math. 60, No. 11, 2241--2262 (2017; Zbl 1402.46027) Full Text: DOI arXiv OpenURL
Nakai, Eiichi Pointwise multipliers on Musielak-Orlicz-Morrey spaces. (English) Zbl 1390.46034 Jain, Pankaj (ed.) et al., Function spaces and inequalities, New Delhi, India, December 11–15, 2015. Singapore: Springer (ISBN 978-981-10-6118-9/hbk; 978-981-10-6119-6/ebook). Springer Proceedings in Mathematics & Statistics 206, 257-281 (2017). MSC: 46E30 PDF BibTeX XML Cite \textit{E. Nakai}, Springer Proc. Math. Stat. 206, 257--281 (2017; Zbl 1390.46034) Full Text: DOI OpenURL
Nguyen, Van Kien; Ullrich, Mario; Ullrich, Tino Change of variable in spaces of mixed smoothness and numerical integration of multivariate functions on the unit cube. (English) Zbl 1376.65028 Constr. Approx. 46, No. 1, 69-108 (2017). Reviewer: Manfred Tasche (Rostock) MSC: 65D32 41A55 41A63 46E35 47B38 PDF BibTeX XML Cite \textit{V. K. Nguyen} et al., Constr. Approx. 46, No. 1, 69--108 (2017; Zbl 1376.65028) Full Text: DOI arXiv OpenURL
Nakai, Eiichi Pointwise multipliers on Musielak-Orlicz spaces. (English) Zbl 1382.46019 Nihonkai Math. J. 27, No. 1-2, 135-146 (2016). MSC: 46E30 46B42 PDF BibTeX XML Cite \textit{E. Nakai}, Nihonkai Math. J. 27, No. 1--2, 135--146 (2016; Zbl 1382.46019) Full Text: Euclid OpenURL
Fujiwara, Kazumasa; Ozawa, Tohru Remarks on bilinear estimates in the Sobolev spaces. (English) Zbl 1359.26022 RIMS Kôkyûroku Bessatsu B56, 1-9 (2016). MSC: 26D15 42B25 PDF BibTeX XML Cite \textit{K. Fujiwara} and \textit{T. Ozawa}, RIMS Kôkyûroku Bessatsu B56, 1--9 (2016; Zbl 1359.26022) OpenURL
Cichoń, Mieczysław; Metwali, Mohamed M. A. On a fixed point theorem for the product of operators. (English) Zbl 1450.47024 J. Fixed Point Theory Appl. 18, No. 4, 753-770 (2016). MSC: 47H10 46E30 45G10 47H30 47N20 PDF BibTeX XML Cite \textit{M. Cichoń} and \textit{M. M. A. Metwali}, J. Fixed Point Theory Appl. 18, No. 4, 753--770 (2016; Zbl 1450.47024) Full Text: DOI OpenURL
Moussai, Madani Realizations of homogeneous Besov and Triebel-Lizorkin spaces and an application to pointwise multipliers. (English) Zbl 1348.46039 Anal. Appl., Singap. 13, No. 2, 149-183 (2015). Reviewer: Winfried Sickel (Jena) MSC: 46E35 PDF BibTeX XML Cite \textit{M. Moussai}, Anal. Appl., Singap. 13, No. 2, 149--183 (2015; Zbl 1348.46039) Full Text: DOI OpenURL
Kolwicz, Paweł; Leśnik, Karol; Maligranda, Lech Pointwise products of some Banach function spaces and factorization. (English) Zbl 1308.46039 J. Funct. Anal. 266, No. 2, 616-659 (2014). MSC: 46E30 46B42 PDF BibTeX XML Cite \textit{P. Kolwicz} et al., J. Funct. Anal. 266, No. 2, 616--659 (2014; Zbl 1308.46039) Full Text: DOI arXiv OpenURL
Kolwicz, Paweł; Leśnik, Karol; Maligranda, Lech Pointwise multipliers of Calderón-Lozanovskiĭ spaces. (English) Zbl 1288.46023 Math. Nachr. 286, No. 8-9, 876-907 (2013). Reviewer: George O. Okikiolu (London) MSC: 46E30 46B42 46A45 PDF BibTeX XML Cite \textit{P. Kolwicz} et al., Math. Nachr. 286, No. 8--9, 876--907 (2013; Zbl 1288.46023) Full Text: DOI arXiv Link OpenURL
Han, Yanchang Pointwise multipliers on inhomogeneous Besov and Triebel-Lizorkin spaces in the setting of spaces of homogeneous type. (English) Zbl 1271.46031 Taiwanese J. Math. 17, No. 1, 179-206 (2013). MSC: 46E35 42B25 42B35 PDF BibTeX XML Cite \textit{Y. Han}, Taiwanese J. Math. 17, No. 1, 179--206 (2013; Zbl 1271.46031) Full Text: DOI Link OpenURL
Akbarbaglu, Ibrahim; Maghsoudi, Saeid An answer to a question on the convolution of functions. (English) Zbl 1247.43003 Arch. Math. 98, No. 6, 545-553 (2012). Reviewer: Enrico Zoli (Firenze) MSC: 43A15 43A20 54E52 PDF BibTeX XML Cite \textit{I. Akbarbaglu} and \textit{S. Maghsoudi}, Arch. Math. 98, No. 6, 545--553 (2012; Zbl 1247.43003) Full Text: DOI OpenURL
Schep, Anton R. Products and factors of Banach function spaces. (English) Zbl 1216.46028 Positivity 14, No. 2, 301-319 (2010). Reviewer: Enrique Alfonso Sánchez-Pérez (València) MSC: 46E30 47B38 PDF BibTeX XML Cite \textit{A. R. Schep}, Positivity 14, No. 2, 301--319 (2010; Zbl 1216.46028) Full Text: DOI arXiv OpenURL
Morosi, Carlo; Pizzocchero, Livio New results on multiplication in Sobolev spaces. (English) Zbl 1197.46018 Adv. Appl. Math. 44, No. 4, 393-432 (2010). Reviewer: Stanisław Wedrychowicz (Rzeszów) MSC: 46E35 26D10 PDF BibTeX XML Cite \textit{C. Morosi} and \textit{L. Pizzocchero}, Adv. Appl. Math. 44, No. 4, 393--432 (2010; Zbl 1197.46018) Full Text: DOI arXiv OpenURL
Morosi, Carlo; Pizzocchero, Livio On the constants for multiplication in Sobolev spaces. (English) Zbl 1114.46025 Adv. Appl. Math. 36, No. 4, 319-363 (2006). Reviewer: Messoud A. Efendiev (Berlin) MSC: 46E35 PDF BibTeX XML Cite \textit{C. Morosi} and \textit{L. Pizzocchero}, Adv. Appl. Math. 36, No. 4, 319--363 (2006; Zbl 1114.46025) Full Text: DOI arXiv OpenURL
Cichoń, Kinga Closed range multiplication operators on weighted Bergman spaces. (English) Zbl 1077.47032 Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 60, No. 1, 37-48 (2005). Reviewer: Bahman Yousefi (Shiraz) MSC: 47B38 46E15 30D50 PDF BibTeX XML Cite \textit{K. Cichoń}, Nonlinear Anal., Theory Methods Appl., Ser. A, Theory Methods 60, No. 1, 37--48 (2005; Zbl 1077.47032) Full Text: DOI OpenURL
Naoum-Adil, Ghasan; Jamil-Zeana, Zaki Pointwise projective modules and some related modules. (English) Zbl 1067.16003 Kyungpook Math. J. 43, No. 4, 471-480 (2003). Reviewer: Xue Weimin (Fujian) MSC: 16D40 16D80 13C10 PDF BibTeX XML Cite \textit{G. Naoum-Adil} and \textit{Z. Jamil-Zeana}, Kyungpook Math. J. 43, No. 4, 471--480 (2003; Zbl 1067.16003) OpenURL
Bogalska, Kinga Multiplication operators on weighted Banach spaces of analytic functions with exponential weights. (English) Zbl 1028.47021 Bull. Pol. Acad. Sci., Math. 49, No. 4, 409-416 (2001). Reviewer: Bahman Yousefi (Shiraz) MSC: 47B38 47-02 PDF BibTeX XML Cite \textit{K. Bogalska}, Bull. Pol. Acad. Sci., Math. 49, No. 4, 409--416 (2001; Zbl 1028.47021) OpenURL
Petukhov, A. P. Multi-scale analysis and wavelet expansions of spaces of periodic distributions. (English. Russian original) Zbl 0989.46023 Dokl. Math. 56, No. 2, 700-703 (1997); translation from Dokl. Akad. Nauk, Ross. Akad. Nauk 356, No. 3, 303-306 (1997). Reviewer: L.Janos (Kent/Ohio) MSC: 46F05 46A16 46F10 42C40 46A35 PDF BibTeX XML Cite \textit{A. P. Petukhov}, Dokl. Math. 56, No. 2, 303--306 (1997; Zbl 0989.46023); translation from Dokl. Akad. Nauk, Ross. Akad. Nauk 356, No. 3, 303--306 (1997) OpenURL
Milani, A. On an algebraic property of some Lebesgue-Sobolev spaces. (English) Zbl 0928.46018 Rend. Semin. Mat., Torino 55, No. 3, 213-239 (1997). MSC: 46E35 35J60 35K55 PDF BibTeX XML Cite \textit{A. Milani}, Rend. Semin. Mat., Torino 55, No. 3, 213--239 (1997; Zbl 0928.46018) OpenURL
Klainerman, Sergiu; Selberg, Sigmund Remark on the optimal regularity for equations of wave maps type. (English) Zbl 0884.35102 Commun. Partial Differ. Equations 22, No. 5-6, 901-918 (1997). Reviewer: L.Skrzypczak (Poznań) MSC: 35L70 35L15 35A05 PDF BibTeX XML Cite \textit{S. Klainerman} and \textit{S. Selberg}, Commun. Partial Differ. Equations 22, No. 5--6, 901--918 (1997; Zbl 0884.35102) Full Text: DOI OpenURL
Runst, Thomas; Sickel, Winfried Sobolev spaces of fractional order, Nemytskij operators and nonlinear partial differential equations. (English) Zbl 0873.35001 de Gruyter Series in Nonlinear Analysis and Applications. 3. Berlin: de Gruyter. x, 547 p. (1996). Reviewer: J.Appell (Würzburg) MSC: 35-02 46-02 46E35 47H30 35Jxx 35Sxx PDF BibTeX XML Cite \textit{T. Runst} and \textit{W. Sickel}, Sobolev spaces of fractional order, Nemytskij operators and nonlinear partial differential equations. Berlin: de Gruyter (1996; Zbl 0873.35001) OpenURL
Marschall, J. Nonregular pseudo-differential operators. (English) Zbl 0840.47040 Z. Anal. Anwend. 15, No. 1, 109-148 (1996). MSC: 47G30 46E35 35S50 PDF BibTeX XML Cite \textit{J. Marschall}, Z. Anal. Anwend. 15, No. 1, 109--148 (1996; Zbl 0840.47040) Full Text: DOI OpenURL
Marková, Andrea Some remarks on the pseudo-linear algebra. (English) Zbl 0860.15002 Tatra Mt. Math. Publ. 6, 123-130 (1995). Reviewer: J.Drewniak (Katowice) MSC: 15A03 15A06 15A24 28E10 PDF BibTeX XML Cite \textit{A. Marková}, Tatra Mt. Math. Publ. 6, 123--130 (1995; Zbl 0860.15002) OpenURL
Sickel, W.; Triebel, H. Hölder inequalities and sharp embeddings in function spaces of \(B_{pq}^ s\) and \(F_{pq}^ s\) type. (English) Zbl 0820.46030 Z. Anal. Anwend. 14, No. 1, 105-140 (1995). MSC: 46E35 PDF BibTeX XML Cite \textit{W. Sickel} and \textit{H. Triebel}, Z. Anal. Anwend. 14, No. 1, 105--140 (1995; Zbl 0820.46030) Full Text: DOI OpenURL
Kurmakaeva, E. Sh. Dependence of strict homological dimension of \(C(\Omega)\) on the topology of \(\Omega\). (English. Russian original) Zbl 0835.46061 Math. Notes 55, No. 3, 289-293 (1994); translation from Mat. Zametki 55, No. 3, 76-83 (1994). MSC: 46M20 46M05 46J10 PDF BibTeX XML Cite \textit{E. Sh. Kurmakaeva}, Math. Notes 55, No. 3, 1 (1994; Zbl 0835.46061); translation from Mat. Zametki 55, No. 3, 76--83 (1994) Full Text: DOI OpenURL
Saǧir, Birsen; Gürkanli, A. Turan The spaces \(B_{w,v}^{p,q}(G)\) and some properties. (English) Zbl 0877.46031 J. Fac. Sci., Ege Univ., Ser. A 17, No. 2, 53-63 (1994). MSC: 46E35 46H25 PDF BibTeX XML Cite \textit{B. Saǧir} and \textit{A. T. Gürkanli}, J. Fac. Sci., Ege Univ., Ser. A 17, No. 2, 53--63 (1994; Zbl 0877.46031) OpenURL
Nakaji, Takahiko (ed.) Research on Hardy spaces related to rings of functions. Proceedings of a symposium held at the Research Institute for Mathematical Sciences, Kyoto University, Kyoto, November 16-18, 1992. (Japanese, English) Zbl 0837.46002 RIMS Kôkyûroku. No. 825. Kyoto: Kyoto Univ., Research Inst. for Mathematical Sciences, ii, 167 p. (1993). MSC: 46-06 47B35 46J15 47-06 30-06 00B25 47A53 47B38 PDF BibTeX XML Cite \textit{T. Nakaji} (ed.), Research on Hardy spaces related to rings of functions. Proceedings of a symposium held at the Research Institute for Mathematical Sciences, Kyoto University, Kyoto, November 16-18, 1992 (Japanese). Kyoto: Kyoto Univ., Research Inst. for Mathematical Sciences (1993; Zbl 0837.46002) OpenURL
Taskinen, Jari An application of averaging operators to multilinearity. (English) Zbl 0804.46032 Math. Ann. 297, No. 3, 567-572 (1993). Reviewer: K.D.Bierstedt (Paderborn) MSC: 46E15 47H99 46J10 46G20 47B10 46B10 46B25 PDF BibTeX XML Cite \textit{J. Taskinen}, Math. Ann. 297, No. 3, 567--572 (1993; Zbl 0804.46032) Full Text: DOI EuDML OpenURL
Todorov, Todor Pointwise kernels of Schwartz distributions. (English) Zbl 0751.03037 Proc. Am. Math. Soc. 114, No. 3, 817-819 (1992). MSC: 03H05 30G06 46S20 46F05 46F10 PDF BibTeX XML Cite \textit{T. Todorov}, Proc. Am. Math. Soc. 114, No. 3, 817--819 (1992; Zbl 0751.03037) Full Text: DOI OpenURL
Amann, Herbert Multiplication in Sobolev and Besov spaces. (English) Zbl 0894.46026 Ambrosetti, A. (ed.) et al., Nonlinear analysis. A tribute in honour of Giovanni Prodi. Pisa: Scuola Normale Superiore, Quaderni. Universitá di Pisa. 27-50 (1991). Reviewer: J.Zafarini (Isfahan) MSC: 46E35 PDF BibTeX XML Cite \textit{H. Amann}, in: Nonlinear analysis. A tribute in honour of Giovanni Prodi. Pisa: Scuola Normale Superiore. 27--50 (1991; Zbl 0894.46026) OpenURL
Roch, S.; Silbermann, B. Representations of noncommutative Banach algebras by continuous functions. (English) Zbl 0791.46022 St. Petersbg. Math. J. 3, No. 4, 865-879 (1992); translation from Algebra Anal. 3, No. 4, 171-185 (1991). MSC: 46H15 46H30 46H35 47A60 PDF BibTeX XML Cite \textit{S. Roch} and \textit{B. Silbermann}, St. Petersbg. Math. J. 3, No. 4, 865--879 (1991; Zbl 0791.46022); translation from Algebra Anal. 3, No. 4, 171--185 (1991) OpenURL
Roch, S.; Silbermann, B. Representations of non-commutative Banach algebras by continuous functions. (English) Zbl 0766.46036 Algebra Anal. 3, No. 4, 171-185 (1991). Reviewer: H.Junek (Potsdam) MSC: 46H15 46H30 46H35 47A60 PDF BibTeX XML Cite \textit{S. Roch} and \textit{B. Silbermann}, Algebra Anal. 3, No. 4, 171--185 (1991; Zbl 0766.46036) OpenURL
Feldman, Mark; Rochberg, Richard Singular value estimates for commutators and Hankel operators on the unit ball and the Heisenberg group. (English) Zbl 0703.47020 Analysis and partial differential equations, Coll. Pap. dedic. Mischa Cotlar, Lect. Notes Pure Appl. Math. 122, 121-159 (1990). Reviewer: P.C.Sinha MSC: 47B35 47B38 PDF BibTeX XML OpenURL
Arai, Asao A criterion for the boundedness from below with a class of symmetric operators and its applications. (English) Zbl 0701.47009 J. Math. Anal. Appl. 145, No. 2, 539-554 (1990). Reviewer: N.Angelescu MSC: 47B25 35J10 49J40 PDF BibTeX XML Cite \textit{A. Arai}, J. Math. Anal. Appl. 145, No. 2, 539--554 (1990; Zbl 0701.47009) Full Text: DOI OpenURL
Hamlett, T. R.; Rose, David A remark on the Banach-Steinhaus theorem. (English) Zbl 0764.46003 Quest. Answers Gen. Topology 7, No. 2, 65-69 (1989). Reviewer: K.Horák (Praha) MSC: 46A32 PDF BibTeX XML Cite \textit{T. R. Hamlett} and \textit{D. Rose}, Quest. Answers Gen. Topology 7, No. 2, 65--69 (1989; Zbl 0764.46003) OpenURL
Blümlinger, Martin; Tichy, Robert F. Topological algebras of functions of bounded variation. I. (English) Zbl 0702.46037 Manuscr. Math. 65, No. 2, 245-255 (1989). Reviewer: M.Fritzsche MSC: 46J10 46E30 PDF BibTeX XML Cite \textit{M. Blümlinger} and \textit{R. F. Tichy}, Manuscr. Math. 65, No. 2, 245--255 (1989; Zbl 0702.46037) Full Text: DOI EuDML OpenURL
Lindsay, J. M. Quantum stochastic calculus with integral kernels. I. (English) Zbl 0691.46053 Probability theory and applications, Proc. World Congr. Bernoulli Soc., Tashkent/USSR 1986, Vol. 1, 485-489 (1987). Reviewer: A.Wehrl MSC: 46N99 46L60 60G05 81Q99 PDF BibTeX XML OpenURL
Takáč, Peter A formula for the resolvent of \((-\Delta)^ m+M_ q^{2m}\) with applications to trace class. (English) Zbl 0643.47025 Trans. Am. Math. Soc. 303, 325-344 (1987). Reviewer: J.Szulga MSC: 47B10 35C15 47A10 47B38 PDF BibTeX XML Cite \textit{P. Takáč}, Trans. Am. Math. Soc. 303, 325--344 (1987; Zbl 0643.47025) Full Text: DOI OpenURL
Korobeĭnik, Yu. F. Continuous multipliers of functional spaces. (Russian) Zbl 0736.47019 Theory of functions and approximations, Proc. 3rd Saratov winter school, Saratov/USSR 1986, Interuniv. Sci. Collect., Part 1, 30-40 (1987). Reviewer: Oldřich John (Praha) MSC: 47B38 46A32 47L05 PDF BibTeX XML Cite \textit{Yu. F. Korobeĭnik}, in: Rational transformations of Hausdorff measures. . 30--40 (1987; Zbl 0736.47019) OpenURL
Kenig, C.; Meyer, Y. Kato’s square roots of accretive operators and Cauchy kernels on Lipschitz curves are the same. (English) Zbl 0641.47039 Recent progress in Fourier analysis, Proc. Semin., El Escorial/Spain 1983, North-Holland Math. Stud. 111, 123-143 (1985). MSC: 47B44 47E05 47A60 47Gxx PDF BibTeX XML OpenURL
Qian, Tao Commutators of multiplier operators. (English) Zbl 0617.47036 Chin. Ann. Math., Ser. B 6, 401-408 (1985). Reviewer: M.Cowling MSC: 47Gxx 35S05 42B20 47B47 PDF BibTeX XML Cite \textit{T. Qian}, Chin. Ann. Math., Ser. B 6, 401--408 (1985; Zbl 0617.47036) OpenURL
Hudzik, H. Orlicz spaces of essentially bounded functions and Banach-Orlicz algebras. (English) Zbl 0579.46021 Arch. Math. 44, 535-538 (1985). MSC: 46E30 PDF BibTeX XML Cite \textit{H. Hudzik}, Arch. Math. 44, 535--538 (1985; Zbl 0579.46021) Full Text: DOI OpenURL
Agarwal, R. P.; Srivastava, Rajiv K. On the space \(G(\lambda)\) of entire functions. (English) Zbl 0551.46016 Indian J. Pure Appl. Math. 14, 707-712 (1983). Reviewer: A.Donescu MSC: 46E20 46H05 46J15 PDF BibTeX XML Cite \textit{R. P. Agarwal} and \textit{R. K. Srivastava}, Indian J. Pure Appl. Math. 14, 707--712 (1983; Zbl 0551.46016) OpenURL
Somasundaram, D. Linear functionals on the spaces of entire functions of several variables over non-Archimedian fields. (English) Zbl 0455.46061 Indian J. Pure Appl. Math. 12, 722-727 (1981). MSC: 46S10 46E10 PDF BibTeX XML Cite \textit{D. Somasundaram}, Indian J. Pure Appl. Math. 12, 722--727 (1981; Zbl 0455.46061) OpenURL
Martignon, Laura Banach f-algebras and Banach lattice algebras with unit. (English) Zbl 0463.46018 Bol. Soc. Bras. Mat. 11, No. 1, 11-17 (1980). MSC: 46E05 46B42 46J10 PDF BibTeX XML Cite \textit{L. Martignon}, Bol. Soc. Bras. Mat. 11, No. 1, 11--17 (1980; Zbl 0463.46018) Full Text: DOI OpenURL
Kalyabin, G. A. Multiplicativity conditions for function spaces of Besov and Lizorkin- Triebel type. (English. Russian original) Zbl 0453.46024 Sov. Math., Dokl. 21, 364-365 (1980); translation from Dokl. Akad. Nauk SSSR 251, 25-26 (1980). MSC: 46E35 46E30 PDF BibTeX XML Cite \textit{G. A. Kalyabin}, Sov. Math., Dokl. 21, 364--365 (1980; Zbl 0453.46024); translation from Dokl. Akad. Nauk SSSR 251, 25--26 (1980) OpenURL
Mantero, Anna Maria; Tonge, Andrew Some remarks on the injective tensor product and Banach algebras. (English) Zbl 0397.46049 Boll. Unione Mat. Ital., V. Ser., A 16, 109-114 (1979). MSC: 46J10 46M05 46E30 PDF BibTeX XML Cite \textit{A. M. Mantero} and \textit{A. Tonge}, Boll. Unione Mat. Ital., V. Ser., A 16, 109--114 (1979; Zbl 0397.46049) OpenURL
Banaschewski, Bernhard; Nelson, Evelyn Tensor products and bimorphisms. (English) Zbl 0392.18003 Can. Math. Bull. 19, 385-402 (1976). MSC: 18A40 46M05 18D20 18D25 PDF BibTeX XML Cite \textit{B. Banaschewski} and \textit{E. Nelson}, Can. Math. Bull. 19, 385--402 (1976; Zbl 0392.18003) Full Text: DOI OpenURL