Radzikowski, Jerzy On the existence of a solution of the mixed problem for a certain hyperbolic system. (English) Zbl 0699.35184 Demonstr. Math. 21, No. 1, 59-75 (1988). Reviewer: A.Doktor MSC: 35M99 35L80 35A05 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Pham ba Trung Qualitative investigations of solutions of some hyperbolic equations with periodic coefficients. (English) Zbl 0698.35016 Demonstr. Math. 21, No. 1, 47-57 (1988). MSC: 35B35 35L20 × Cite Format Result Cite Review PDF
Michalski, Marek A Goursat problem for a polyvibrating equation of Mangeron. (English) Zbl 0689.35049 Demonstr. Math. 21, No. 1, 215-230 (1988). Reviewer: J.Tian MSC: 35L35 35G15 35R99 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Rabsztyn, Szymon On some inequality for traces. (English) Zbl 0687.47014 Demonstr. Math. 21, No. 1, 307-309 (1988). Reviewer: J.C.Rho MSC: 47B10 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Popa, Valeriu Fixed point theorems for commuting mappings. (English) Zbl 0678.54035 Demonstr. Math. 21, No. 1, 143-151 (1988). MSC: 54H25 54C60 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Pusz, Jerzy On a characterization of probability distributions by conditional expectations. (English) Zbl 0666.62009 Demonstr. Math. 21, No. 1, 247-253 (1988). Reviewer: B.K.Horkelheimer MSC: 62E10 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Pop, Ioan Power maps on special orthogonal groups. (English) Zbl 0662.22015 Demonstr. Math. 21, No. 1, 269-290 (1988). Reviewer: Melih Boral (Istanbul) MSC: 22E60 58C25 58K99 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Ismail, Nazdar On m-representation of m-complete pseudo Boolean algebra. (English) Zbl 0659.06010 Demonstr. Math. 21, No. 1, 27-35 (1988). Reviewer: V.Meskhi MSC: 06D20 06B23 × Cite Format Result Cite Review PDF Full Text: DOI
Barsoom, Magdy Yousef On the asymptotic behaviour of solutions of linear systems of two ordinary equations of first order. (English) Zbl 0657.34010 Demonstr. Math. 21, No. 1, 201-214 (1988). Reviewer: J.Ohriska MSC: 34A30 34E05 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Yue Chi Ming, Roger On non-singular rings and semi-prime rings. (English) Zbl 0657.16006 Demonstr. Math. 21, No. 1, 291-306 (1988). Reviewer: A.C.Mewborn MSC: 16E50 16N60 16D50 16Dxx × Cite Format Result Cite Review PDF
Rogowski, Andrzej Existence of solution of nonconvex optimization in Banach space. (English) Zbl 0653.49008 Demonstr. Math. 21, No. 1, 175-188 (1988). Reviewer: A.Rogowski MSC: 49J27 46B99 49K27 49J45 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Gouli-Andreou, Florence; Demetropoulou-Psomopoulou, Demetra On connections on manifolds admitting an \(f(5,1)\)-structure. (English) Zbl 0649.53019 Demonstr. Math. 21, No. 1, 127-140 (1988). Reviewer: Witold Mozgawa (Lublin) MSC: 53C15 × Cite Format Result Cite Review PDF
Pathan, M. A.; Yasmeen On generating functions of a general triple hypergeometric series. (English) Zbl 0649.33001 Demonstr. Math. 21, No. 1, 11-26 (1988). Reviewer: P.W.Karlsson MSC: 33C05 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Majchrzak, Wiesław On roots of the equation \(f(z)=\Omega (z)f(a)\) in the classes of functions represented by the Stieltjes integral. (English) Zbl 0649.30034 Demonstr. Math. 21, No. 1, 153-174 (1988). Reviewer: J.Kaczmarski MSC: 30E99 × Cite Format Result Cite Review PDF Full Text: DOI
Jakubowski, Jacek On the maximum absolute partial sums of bounded P-weakly multiplicative systems. (English) Zbl 0648.60032 Demonstr. Math. 21, No. 1, 37-45 (1988). Reviewer: J.Jakubowski MSC: 60F15 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Singh, K. D.; Srivastava, O. P. On semi-invariant submanifolds of an almost paracontact Riemannian manifold. (English) Zbl 0648.53020 Demonstr. Math. 21, No. 1, 255-268 (1988). Reviewer: Z.Olszak MSC: 53C15 53B25 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Mikołajski, Jarosław On nonoscillatory linear systems of difference equations. (English) Zbl 0647.39006 Demonstr. Math. 21, No. 1, 231-246 (1988). Reviewer: V.C.Boffi MSC: 39A10 39A11 × Cite Format Result Cite Review PDF
Murge, M. G.; Pachpatte, B. G. On a generalized Itô type stochastic hereditary equation. (English) Zbl 0646.60064 Demonstr. Math. 21, No. 1, 77-103 (1988). Reviewer: M.G.Murge MSC: 60H10 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Grabski, Zbigniew; Mikołajczyk, Leon Existence theorem for some minimax problem. (English) Zbl 0644.49009 Demonstr. Math. 21, No. 1, 189-199 (1988). MSC: 49J35 49K35 90C30 × Cite Format Result Cite Review PDF Full Text: DOI
Kumar, Naresh; Srivastava, G. S. On the proximate order of an entire function with index pair (p,q). (English) Zbl 0644.30017 Demonstr. Math. 21, No. 1, 1-10 (1988). Reviewer: O.P.Juneja MSC: 30D15 × Cite Format Result Cite Review PDF Full Text: DOI OA License
Dziubiński, Izydor; Połubiński, Jerzy On some method of solving linear equations. III. (English) Zbl 0623.47009 Demonstr. Math. 21, No. 1, 105-125 (1988). MSC: 47A50 47B38 × Cite Format Result Cite Review PDF