Homology of the 2 point sets
Hi, I want to find out the homology groups (over some commutative ring K) of the 2 element spaces. Up to homeomorphism, there are only
1) the discrete 2 element space
2) the trivial one
3) the intermediate one with 3 open sets
So far I only know the definiton of homology of X, i.e. we look at n simplices and form a chain complex out of continuous functions into X.
1) The discrete space is easy, as only constant functions are continuous which leads to H_0 = K^2 and H_n = 0 for n > 0
For the other 2 cases I cant figure out what to do. In the trivial topology all functions are continuous, which leads to a huge chain complex, in the intermediate topology only some are, well you see I need some help...