Deforming nonnormal isolated surface singularities and constructing 3-folds with P^1 as exceptional set
Preprint, 2015

Normally one assumes isolated surface singularities to be normal. The purpose of this paper is to show that it can be useful to look at nonnormal singularities. By deforming them interesting normal singularities can be constructed, such as isolated, non Cohen-Macaulay threefold singularities. They arise by a small contraction of a smooth rational curve, whose normal bundle has a sufficiently positive subbundle. We study such singularities from their nonnormal general hyperplane section.

Författare

Jan Stevens

Chalmers, Matematiska vetenskaper, Matematik

Göteborgs universitet

Ämneskategorier

Matematik

Fundament

Grundläggande vetenskaper