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1991, Volume 50, Issue 6  

Subgroups of the braid group $B_4$
A. M. Akimenkov 		3–13
Maximum principle for spatial quasiconformal mappings
O. A. Asadchii 		14–23
On best uniform approximations by splines in the presence of restrictions on their derivatives
V. F. Babenko 		24–30
On the level density of random band matrices
L. V. Bogachev, S. A. Molchanov, L. A. Pastur 		31–42
Sturm–Liouville problem with irregular asymptotics of eigenvalues
V. A. Borovikov 		43–51
A completeness criterion of subgroups of finite covolume in a Lie group
V. V. Gorbatsevich 		52–56
An inverse approximation theorem in various metrics
N. A. Il'yasov 		57–65
Factorizations of a nonlinear wave equation
A. A. Lokshin, E. A. Sagomonyan 		66–70
Solvability of Fuchsian equations depending on a parameter
V. V. Lychagin 		71–84
Optimal recovery of functionals based on inaccurate data
G. G. Magaril-Il'yaev, K. Yu. Osipenko 		85–93
Optimization of differential inclusions with state constraints and duality
E. N. Makhmudov 		94–104
Existence conditions for solutions of quasidifferential equations which do not belong to the space $\mathscr L^p(0,+\infty)$
K. A. Mirzoev 		105–115
$CR$-straightening of real manifolds in $C^n$
S. I. Pinchuk, Sh. I. Tsyganov 		116–121
Jumps of certain classes of $\Delta^0_2$-sets
V. L. Selivanov 		122–125
A problem on the uniform continuity of a family of nonadditive set functions
T. A. Sribnaya 		126–130
Cyclic homology of certain topological spaces formal in the sense of Sullivan
A. E. Tralle 		131–141

Brief Communications
Estimation of the negative spectrum of a lower semibounded self-adjoint operator
K. Kh. Boimatov, Ya. T. Sultanaev 		142–145
On the Kneser embedded edge theorem
M. M. Smirnov 		145–147
Математические заметки Mathematical Notes
 
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