Download Algebraic K-Theory: Conference on Algebraic K-Theory : by Grzegorz Banaszak, Wojciech Gajda, Piotr Krason PDF

By Grzegorz Banaszak, Wojciech Gajda, Piotr Krason

This publication comprises complaints of the study convention on algebraic $K$-theory that happened in Poznan, Poland, in September 1995. The convention concluded the job of the algebraic $K$-theory seminar held on the Adam Mickiewicz college within the educational 12 months 1994-1995. Talks on the convention lined quite a lot of present examine actions in algebraic $K$-theory. particularly, the subsequent themes have been lined: $K$-theory of fields and earrings of integers; $K$-theory of elliptic and modular curves; idea of causes, motivic cohomology, Beilinson conjectures; and, algebraic $K$-theory of topological areas, topological Hochschild homology and cyclic homology. With contributions by means of a few top specialists within the box, this ebook offers a glance on the nation of present study in algebraic $K$-theory

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Additional resources for Algebraic K-Theory: Conference on Algebraic K-Theory : September 4-8, 1995 the Adam Mickiewicz University, Poznan, Poland

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66]. 5 (Finding univariate polynomials). Given an ideal I ~ K[X1' ... ,xn] and an index i E {l, ... , n} such that In K[x;] -:P {O}, find a non-zero polynomial f E In K[Xi] as follows: 9 of I with respect to an arbitrary monomial ordering. For d = 0,1,2, ... perform steps (3)-(4). Compute the normal form NFg(xt). ), ... ,NF 9 (xt) is linearly independent over K. If it is, continue the loop for the next d. Otherwise, go to step 5. If (1) Compute a Grabner basis (2) (3) (4) (5) d L>~j NFg(xi) = 0 j=O is a K-linear relation found in step (4), then desired polynomial.

We define the resultant of 9 and h as the (d + e) x (d + e)-determinant ao al ... ad ao al ad Res(g, h) = ao al ... ad bo bl ... be bo bl be bo bl be Since K is algebraically closed, we can write 9 and h as a product of linear functions 42 2 Invariant Theory d 9= e II (PiX + qiY), h= i=1 II (ri X + SiY)· i=1 Then we find d Res(g, h) = II II (PiSj - qirj). 2), it is easy to check that Res(g, h) is an invariant function in K[Vd EB Vel which vanishes if and only if 9 and h have a common zero in jp'1.

2 Reductive Groups As we have remarked in the previous section, the invariant ring K[V]G is not always finitely generated. A sufficient condition for the invariant ring K[V]G to be finitely generated is that G is a reductive group. There are different notions of reductivity, namely, linearly reductive, geometrically reductive and group theoretically reductive (also referred to as just reductive). In characteristic zero all notions coincide. In positive characteristic geometric reductivity and reductivity are still the same, but linear reductivity is stronger.

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