1980, f. 2, tomul XXVI

Ștefănescu, M.: On semi-simple infra-near rings (II), p. 253
Topentcharov, V.V.; Arnaoudov, Y.N.: Quelques liens entre les n-categories et les (n)-categories, p. 261
Tofan, I.: Sur les catégories internes, p. 267
Curteanu, N.: A fuzzy extension of de Bakker’s semantics, p. 271
Prasad, R.; Saxena, A.: On the uniform matrix summability of Fourier series, p. 281
Popa, E.: Notion de spectre dans une categorie quelconque (I), p. 287
Udriște, C.N.: Subgradients of convex functions on Riemannian manifolds, p. 303
Philos, C.G.; Staikos, V.A.: Boundedness and oscillation of solutions of differential equations with deviating argument, p. 307
Simirad, C.: Oscillations de certains systèmes differentiels impliquées par l’existence des solutions bornées (I), p. 318
Joshi, S.R.; Deo, S.G.: On abstract measure delay differential equations, p. 327
Hiriș, V.; Megan, M.: Hyperstability for linear parabolic systems, p. 337
Moroșanu, G.: Existence for nonlinear differential systems of hyperbolic type, p. 345
Aizicovici, S.: An integrodifferential equation with a discontinuous non-linearity, p. 353
Pachpatte, B.G.: On some fundamental n-th order finite difference inequalities, p. 361
Pop, I.: A K. Morita type theorem for closure algebras, p. 369
Anastasiei, M.: Generalized affine connections on Banach manifolds, p. 381
Ianuș, S.; Popovici, I.: On the Vranceanu’s Nonholonomic connection, p. 389
Rimer, D.: La géométrie différentielle des complexes de quadriques, dans l’espace equiaffine A₃, p. 393
Jucan, T.: Some properties of m-cyclic interactive language, p. 401
Smadici, C.: On a discrete optimization problem, p. 407
Marcu, D.: Some remarks concerning the kernels of a strong connected digraph, p. 417
Book reviews, p. 419