Abstract:
I will tell about the connection between relative Milnor K-groups KMn(R,I) of a split nilpotent extension (R,I) and it's modules of Kahler differential forms. Namely, let R be a ring and I⊂R be its nilpotent ideal such that R/I splits and IN=0 for some natural N such that N! is invertible in R. I will show that in this case there exists functorial homomorphism called Bloch map (since it was originally developed by S.Bloch) from relative Milnor K–group KMn+1(R,I) to the quotient group ΩnR,I/dΩn−1R,I wich can be considered as a canonical integral for the map dlog. Moreover, under the assumption that R is weakly 5-fold stable this map is an isomorphism.
If time permits I will also tell about a particulary interesting geleralization of the Bloch map B to the case of p-adically complete ring R with a δ-structure.