Weierstrass preparation and algebraic invariants

Details Weierstrass preparation and algebraic invariants Weierstrass preparation and algebraic invariants

2011-09-28

arxiv.org/abs/1109.6362v1

Mathematics

Rings and Algebras

20 pages

Scientific paper

We prove a form of the Weierstrass Preparation Theorem for normal algebraic curves over complete discrete valuation rings. While the more traditional algebraic form of Weierstrass Preparation applies just to the projective line over a base, our version allows more general curves. This result is then used to obtain applications concerning the values of u-invariants, and on the period-index problem for division algebras, over fraction fields of complete two-dimensional rings. Our approach uses patching methods and matrix factorization results that can be viewed as analogs of Cartan's Lemma.

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