Zap. Nauchn. Sem. LOMI, 1973, Volume 36

Zapiski Nauchnykh Seminarov LOMI

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1973, Volume 36

Contents

Investigations in topology

	Preface A. A. Ivanov		4–5
	Two-sheeted branched coverings of the three-dimensional sphere O. Ya. Viro		6–39
	Theorem on decomposition for simply connexted six-dimensional manyfolds A. V. Zhubr		40–49
	Extension structures A. A. Ivanov		50–125
	Enrichments A. A. Ivanov		126–133
	On calculation of signatures and defects of the elementary links V. M. Nezhinskii		134–145
	Almost smooth two-dimensional submanyfolds of four-dimensional manyfolds and some link invariants S. A. Popov		146–154