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CONTENTS Let M and P be Seifert 3-manifolds. Is there a degree one map 1. Introduction f : M-> P ? The problem was completely solved by Hayat-2. A Bit of Theory Legrand, Wang, and Zieschang for all cases except when P is the 3. How to Calculate the Boundary Cycle Poincare homology sphere. We investigate the remaining case 4. How to Calculate the… (More)

Our goal is to describe an economic way of presenting 3-manifolds numerically. The idea consists in replacing 3-manifolds by cell complexes (their special spines) and encoding the spines by strings of integers. The encoding is natural, i.e., it allows one to operate with manifolds without decoding. We describe an application of the encoding to computer… (More)

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