Mat. Sb. (N.S.), 1971, Volume 85(127), Number 1(5)

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1971, Volume 85(127), Number 1(5)

	Regular components of homeomorphisms of the $n$-dimensional sphere S. Kh. Aranson, V. S. Medvedev		3
	On a criterion for hypoellipticity V. S. Fedii		18
	The number of closed nonselfintersecting contours on a planar lattice F. A. Berezin		49
	Factorization of matrices depending on a parameter, and elliptic equations in a halfspace M. A. Shubin		65
	Chern classes of ample bundles V. M. Barenbaum		85
	Imbedding of zero-dimensional compacta in $E^3$ E. V. Sandrakova		98
	Solvable just-non-cross varieties of groups A. Yu. Ol'shanskii		115
	Density of Cauchy initial data for solutions of elliptic equations V. I. Voitinskii		132
	Some transversality theorems S. M. Vishik		140
	Supplement to the article “Three-dimensional varieties with rational sections” (vol. 81(123) (1970), 623–633) B. V. Martynov		157