STNB2018 (32è any)
Universal prevaluations
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Resumen
I will explain how can extend a bit the notion of valuation (on a ring, or a general semiring) in order to have a universal valuation. This theory of (pre)valuations can then be extended to all Schemes. In order to do this I will explain that there are two posible natural notion of Spec for a semiring and how both notions are related precisely under the universal prevaluation. The talk is elementary, and I will show several examples.
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