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A description is obtained for the homeotopy group (the group of isotopy classes of homeomorphisms) of a compact irreducible sufficiently large 3-manifold (which may contain 2-sided projective planes). It is finitely presented, and modulo finite groups is either free, GL(3,Z), or is built up in a certain way by extensions starting from 2-manifold homeotopy groups and finitely generated abelian groups

Homeotopy groups of irreducible 3-manifolds which may contain two-sided projective planes