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Algebraic and topological K-theory, relations with topology, commutative algebra, and operator algebras

3 votes

K_2 of rings of algebraic integers

For the conjectural order, see the Birch-Tate conjecture http://eom.springer.de/B/b110560.htm .
Charles Matthews's user avatar
2 votes

Who named it the Snake Lemma?

If you Google for "diagramme du serpent" it becomes plausible that it was a diagram in Cartan-Eilenberg first of all, before a lemma. Interesting example of how Bourbaki became the standard grad stude …
Charles Matthews's user avatar
11 votes

Where do all these projection formulas come from?

The first (set theory) formula is generalised in categorical logic to what is called "Frobenius reciprocity" there, and is then part of the handling of the existential quantifier (a natural way to go …
Charles Matthews's user avatar