Morphisms represented by monomorphisms

Details Morphisms represented by monomorphisms Morphisms represented by monomorphisms

2004-04-13

arxiv.org/abs/math/0404243v1

Mathematics

Commutative Algebra

22 pages

Scientific paper

Every homomorphism of modules is projective-stably equivalent to an epimorphism but is not always to a monomorphism. We prove that a map is projective-stably equivalent to a monomorphism if and only if its kernel is torsionless, that is, a first syzygy. If it occurs although, there can be various monomorphisms that are projective-stably equivalent to a given map. But in this case there uniquely exists a "perfect" monomorphism to which a given map is projective-stably equivalent.

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