Bulletin de l'Institute de Matématiques
Tome 11, 1970
C O N T E N T S
Borisov, A.
Curves and surfaces in the three-dimensional space with an absolute, consisting of two real points of their common line I
(Bulgarian. Russian and German summaries) 5−16
Gheorghiev, G.
Sur la méthode du repère mobile. (The method of the moving trihedral)
(French. Bulgarian and Russian summaries) 17−25
Stanilov, G., R. Sulanke.
Crofton's formulas in the theory of line congruences in the Euclidean space E
n
(Russian. Bulgarian and German summaries) 27−37
Stanilov, G.
Integral geometry of generalized biaxial spaces
(Bulgarian. Russian and German summaries) 39−53
Bilchev, S.
Three-dimensional surfaces in four-dimensional Euclidean space that support a totally holonomic 3-web of lines of curvature
(Russian. Bulgarian and English summaries) 55−66
Popov, V. A.
Approximation of convex sets
(Bulgarian. Russian and English summaries) 67−80
Mitov, D.
Frenet formulae for curves in the n-dimensional quasi-Euclidean space
(Bulgarian. Russian and French summaries) 81−93
Dolapčiev, B.
The "least instability" of two-parameter vortex streets
(Bulgarian. Russian and German summaries) 95−105
Sendov, Bl., V. A. Popov.
Convergence of the derivatives of positive linear operators
(Bulgarian. Russian and English summaries) 107−115
Popov, V. A.
Approximation of convex functions with polygones
(Bulgarian. Russian and English summaries) 117−126
Diamandiev, V.
The kinematical meaning of a swarm, formed by the helical axes at a general helical motion
(Bulgarian. Russian and English summaries) 127−144
Ivanov, I.
Geometrical interpretation of the lines of curvature on planes in the biaxial hyperbolic space
(Bulgarian. Russian and German summaries) 145−148
Anchev, A.
On the relative equilibrium of a satellite with rotors
(Bulgarian. Russian and English summaries) 149−158
Obretenov, A., B. Dimitrov, M. Uzunov.
Study on the reliability of a system by means of stochastic processes
(Bulgarian. Russian and English summaries) 159−180
Gabdulkhaev, B. G.
Cubature formulae for multidimensional singular integrals. I.
(Russian. Bulgarian and English summaries) 181−196
Manolov, S.
Some cases of the existence and construction of periodic solutions of a certain class of nonlinear systems with a small parameter, connected with polynomials of given form
(Bulgarian. Russian and French summaries) 197−212
Stoyanov, N.
The stability of a nonlinearq governed system in the critical case of a zero root and a pair of purely imaginary roots
(Russian. Bulgarian and English summaries) 213−220
Sendov, Bl., R. Canev, E. Mateeva.
A matematical model of the regulationm of cellular proliferation of the epidermis
(Bulgarian. Russian and English summaries) 221−246
Dochev, K.
Quadratic algebras
(Bulgarian. Russian and French summaries) 247−255
Petkov, M.
A generalized reflection matrix
(Bulgarian. Russian and English summaries) 257−260
Čukanov, V.
Direct decompositions of projective modules
(Bulgarian. Russian and French summaries) 261−267
Gavrilov, M.
On T-ideals containing the element [x
1
, x
2
, x
3
, x
4
[x
5
, x
6
]]
(Bulgarian. Russian and English summaries) 269−271
Pirgov, D., E. Kantardzhieva.
Certain theorems on the indecomposibility of integer polynomials in the field of rational numbers whose values are powers of a prime
(Bulgarian. Russian and German summaries) 273−279
Bradistilov, G., G. Boyadzhiev.
Periodic solutions of a weakly nonlinear autonomic system differential equations by critical case
(Bulgarian. Russian and English summaries) 279−284
Iliev, L.
Most general trends and forecasts of current mathematics
(Russian. Bulgarian and German summaries) 285−294
Ivanova-Karatopraklieva, I.
Second order invariants of three-parameter families of lines in P
4
(Bulgarian. Russian and German summaries) 295−305
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