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

6 votes
2 answers
2k views

Understanding the product in topological K-theory

I apologize that this is perhaps not adequate for mathoverflow but I have struggled with this for days now and become desperate... The reduced K-group $\tilde{K}(S^0)$ of the zero sphere is the ring …
11 votes
1 answer
2k views

K-theory as a generalized cohomology theory

Which of the statements is wrong: a generalized cohomology theory (on well behaved topological spaces) is determined by its values on a point reduced complex $K$-theory $\tilde K$ and reduced real $ …
7 votes
2 answers
412 views

Relation between $KO$ and $K$

What can be said about the relation between the complex and the real K-theory of a CW complex? An $n$-dimensional complex vector bundle is an $2n$-dimensional real vector bundle but not vice versa. Yo …