Another definition of Euler class group of a Noetherian ring
We will give another definition of Euler class group of a Noetherian ring.
math.AC↗
arXiv subjects
Manoj K Keshari
Publications and source records attributed to Manoj K Keshari.
K_0 of hypersurfaces defined by x_1^2+ ... + x_n^2 = \pm 1
Let $k$ be a field of characteristic $\ne 2$ and let $Q_{n,m}(x_1, ...,x_n,y_1, ...,y_m)=x_1^2+ ... +x_n^2-(y_1^2+ ... +y_m^2)$ be a quadratic form over $k$. Let $R(Q_{n,m})=R_{n,m}=k[x_1, ...,x_n,y_1, ...,y_m]/(Q_{n,m}-1)$. In this note we will calculate $\wt K_0(R_{n,m})$ for every $n,m \geq 0$.
math.KT↗
Some results on Euler class groups
Let A be a regular domain of dimension d containing an infinite field and let n be an integer with 2n\geq d+3. For a stably free A-module P of rank n, we prove that (i) P has a unimodular element if and only if the euler class of P is zero in E^n(A) and (ii) we define Whitney class homomorphism w(P):E^s(A)\ra E^{n+s}(A), where E^s(A) denotes the sth Euler class group of A for s\geq 1.
math.AC↗