Modules of principal parts on the projective line

Details Modules of principal parts on the projective line Modules of principal parts on the projective line

2001-11-13

arxiv.org/abs/math/0111149v1

Mathematics

Algebraic Geometry

15 pages

Scientific paper

We study the splitting-type of the bi-modules of principal parts (Grothendiecks analogue of jet-bundles in algebraic geometry) as left and right O-module on the projective line in positive characteristic, and obtain explicit examples where the splitting-type as left O-module differs from the splitting-type as right O-module. Hence the principal parts are the first examples of a sheaf of abelian groups equipped with two non-isomorphic structures as locally free O-module. We also give explicit examples showing that in some cases the splitting-type changes with the characteristic of the base-field.

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