|WikiProject Mathematics||(Rated B-class, High-importance)|
Why does singular cohomology link to this page, if cohomology is never mentioned? 3:58 PM CST 28 Dec 2004.
I think a table of common homology groups or a link to one (should someone know where one might be found) would be very useful. Alexwright 19:57, 29 November 2006 (UTC)
What is Z_n in the section "Singular chain complex". It seems to be invoked without having ever been defined. Should it be C_n? Or do you mean the center of something?220.127.116.11 (talk) 21:15, 28 November 2009 (UTC)