Serdica Bulgariacae mathematicae publicationes
Volume 6, 1980
Number 1

Imanaliev, M., K. Alymkulov.
Determination of periodic solutions of nonlinear wave equations.
(in Russian)
(pp. 38)

Dimitrov, D. G., V. A. Popov.
A generalization of Timan's theorem for approximation of functions by algebraic polynomials.
(pp. 915)

Kirov, G. Kh.
Some extremal problems for ksplines. (in Russian)
(pp. 1620)

Chakalov, V. L., E. M. Dimitrov.
Interpolation and uniform approximation of conjugate functions.
(in Russian)
(pp. 2128)

Petrushev, P. P.
Best rational approximations in the Hausdorff metric. (in Russian)
(pp. 2941)

Tkachenko, M. G.
The behaviour of cardinal functions
on inverse spectra consisting of topological spaces.
(pp. 4255)

Buda, Anatolij O.
Program machines and transducers of trees. (in Russian)
(pp. 5662)

StoyanovaVenkova, A. N.
On bases of identities of Grassmann algebras. (in Russian)
(pp. 6372)

Khadzhiivanov, N. G.
On absolutely nonzero solutions of some algebraic congruences. (in Russian)
(pp. 7375)

Andreev, A. S.
Stability of best approximations in relation to Hausdorff distance. (in Russian)
(pp. 7683)

Boyanov, T. P.
Exact asymptotic behavior of the best Hausdorff approximation of classes of functions with a given modulus of continuity. (in Russian)
(pp. 8497)

Tashev, S. P.
Existence of the solution of a differential equation with a manyvalued righthand side. (in Russian)
(pp. 98104)
Number 2

Gol'dberg, V. V.
On the theory of 4webs of
manydimensional surfaces on differentiable manifold X_{2r}. (in Russian)
(pp. 105119)

Petrushev, P. P.
Lower bounds for best rational approximations in the Hausdorff metric. (in Russian)
(pp. 120127)

Nenov, N. D., N. G. Khadzhiivanov.
On minimal tgraphs. (in Russian)
(pp. 128142)

Dimitrov, M. Ts.
A singleserver M/M/1 system with a generalized dynamic priority. (in Russian)
(pp. 143152)

Bozinov, N. S., I. H. Dimovski.
A representation of the commutant of the initial value SturmLiouville operator.
(pp. 153166)

Popivanov, P. R., G. S. Popov.
Microlocal properties of a certain class of pseudodifferential operators with multiple characteristics. (in Russian)
(pp. 167181)

Radnev, P.
Projective objects in the category of prings. (in Russian)
(pp. 182184)

Totkov, G. A.
Inverse theorems for approximations by splines in Orlicz spaces. (in Russian)
(pp. 185197)
Number 3

Stratigos, P. D.
Extensions of additive setfunctions.
(pp. 197201)

Petrushev, P. P.
Rational approximations of functions with bounded variation in the Hausdorff and integral metric. (in Russian)
(pp. 202210)

Petrov, K. P.
Bornology of polynormed algebras. (in Russian)
(pp. 211218)

Bozinov, N. S.
Differentiation properties and multipliers of BergDimovski convolution for the differentiation operator.
(pp. 219239)

Todorov, V. T.
On a Mazurkiewicz theorem.
(pp. 240244)

Iliev, I. D.
On the boundary problems in a halfspace for a class of nonhypoelliptic equations with constant strength.
(pp. 245257)

Nachev, N. A., T. Zh. Mollov.
UlmKaplansky invariants of the group of normed units of a modular group ring of a primary Abelian group. (in Russian)
(pp. 258263)

Cobanow, G. S.
Räumlich homogene kritische
Verzweigungsprozesse mit kontinuierlicher Zeit. I. (in German)
(pp. 264269)

Nenov, N. D.
On the existence of a minimal tgraph with a given number of vertices. (in Russian)
(pp. 270274)

Veselinov, V. M., I. Kirkorov.
A general estimation for a certain class of linear operators. (in Russian)
(pp. 275277)

Andreev, A. S., R. P. Maleev.
Estimate of the error of the finite element method for onedimensional boundary value problems. (in Russian)
(pp. 278283)

Debes, H.
Random motions of infinite particle
systems on R^{1} without overtaking.
(pp. 284290)
Number 4

Nedev, S. I.
Selection and factorization theorems for setvalued mappings.
(pp. 291317)

Martinov, N. J.
On the number of triangles of a graph. (in Russian)
(pp. 318323)

Fichter, K.H., J. Kerstan.
Invarianz von Punktprozessen bei zufälligen Bewegungen. I. (in German)
(pp. 324340)

Saxena, R. B., T. C. Joshi.
Inhomogeneous lacunary
interpolation by splines. I: (0.2:0.3) case.
(pp. 341351)

Iliev, V. V.
Surfaces with p_{g}=3, K^{2}=3. I.
(in Russian)
(pp. 352362)

Shopov, P. P.
On a classification of irrational numbers with respect to approximation and its application to the metric theory of continued fractions. (in Russian)
(pp. 363372)

Nenov, N. D.
A new estimation from below for the GrahamSpencer number N(3,5). (in Russian) (pp. 373383)

Ioakimidis, N. I., P. S. Theocaris.
A remark on the LobattoChebyshev method for the solution of singular integral equations and the evaluation of stress intensity factors.
(pp. 384390)

Meshalkin, L. D.
New results in the mathematical techniques for the investigation of chronic diseases. (in Russian)
(pp. 391396)
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