Tuesday, April 3, 2018

Tuesday, April 3, 2018 — 1:30 PM EDT

Jason Bell, Department of Pure Mathematics, University of Waterloo

"Last talk of the seminar"

MC 5479

Tuesday, April 3, 2018 — 3:00 PM EDT

Farida Shahata, Department of Pure Mathematics, University of Waterloo

"More projective geometry"

Projective schemes make a comeback! Following our previous discussion on closed immersions and closed subschemes, the next natural step is to study closed embeddings of projective schemes. 

As for affine schemes, we will see that a surjection of graded rings induces a closed embedding of projective schemes. Conversely, every closed subscheme of a projective scheme arises from a graded ideal, hence, is projective itself. 

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