The Stacks project

Typos in proof key formula in chow

Thanks to Xia
https://stacks.math.columbia.edu/tag/0AYB#comment-2981

Simplify proof key lemma in chow

Large set of changes in order to simplify the proof of the key lemma
used in proofs of properties for intersecting with effective Cartier
divisors and capping with c_1 of invertible modules.

Probably the original proof was a bit too original. It is still there
in an appendix, but the current proof can be read within an hour by
those familiar with standard (Noetherian) commutative algebra. The
original proof required checking commutativity of many diagrams and
checking many signs.

We also added more explanation of what is happening in the introduction
as well as a comment on Milnor K-theory giving the reference to Kato's
paper and how it is more general.

Move some material on Weil divisors to divisors.tex

Tags: Added new tags

Key lemma

Much better to have the most general lemma using the secondary
ramification statement for tame symbols directly and then try to deduce
EVERYTHING from this. The really will simplify the logic of this
chapter.