# Benja

less info
reputation
22482
bio website location age member for 1 year, 3 months seen 3 hours ago profile views 6,870

# 4,390 Actions

 Nov30 comment Proving that $\operatorname{codim}(X,Y)=\dim(\mathcal{O}_{X,\eta})$ @ArthurStuart Note that the Noetherian hypothesis is superfluous. Nov30 revised Proving that $\operatorname{codim}(X,Y)=\dim(\mathcal{O}_{X,\eta})$ added 6 characters in body Nov30 comment An irreducible curve of degree 3 has one singular point @Miguemate I posted an answer for (2) that doesn't rely on one. Nov30 revised An irreducible curve of degree 3 has one singular point added 360 characters in body Nov30 comment Classifying extensions of a $k$-algebra Not sure if this helps but the cokernel of $\alpha$ can also be identified with $\operatorname{Ext}^1_A(\Omega_{A/k},I)$. The elements of this ext group are in bijective correspondence with isomorphism classes of $A$-modules $B$ that fit into $0\to \Omega_{A/k} \to B \to I \to 0$. Perhaps there's something to extract out of here. Nov30 revised Proving that $\operatorname{codim}(X,Y)=\dim(\mathcal{O}_{X,\eta})$ added 1 characters in body Nov30 answered Proving that $\operatorname{codim}(X,Y)=\dim(\mathcal{O}_{X,\eta})$ Nov29 revised An irreducible curve of degree 3 has one singular point edited title Nov29 revised An irreducible curve of degree 3 has one singular point added 939 characters in body Nov29 answered An irreducible curve of degree 3 has one singular point Nov29 comment Can $\operatorname{Spec}(R[X])$ ever be finite? @Sebastian Take $m$ a maximal ideal of $R$. The surjection you want is $R \to R/m$. Nov29 answered Complex Analysis and showing that in disk $(0,1)$, $f(z)= sin\ z$. Nov27 revised How can we form $I/(I + \mathfrak{m}^2)$? added 33 characters in body Nov27 revised How can we form $I/(I + \mathfrak{m}^2)$? deleted 2 characters in body Nov27 revised How can we form $I/(I + \mathfrak{m}^2)$? added 16 characters in body Nov27 comment How can we form $I/(I + \mathfrak{m}^2)$? I posted an answer below if any of you are interested. Nov27 answered How can we form $I/(I + \mathfrak{m}^2)$? Nov25 awarded Nice Answer Nov24 revised Norm of Fredholm integral operator equals norm of its kernel? edited title Nov24 revised Norm of Fredholm integral operator equals norm of its kernel? edited body