Wikipedia:Reference desk/Archives/Mathematics/2009 April 19

= April 19 =

Splitting lemma
Hi! Could anyone show me a reference concerning the Splitting lemma? I think about a handbook where the lemma and its proof are explicitly included (a book on homological algebra, ...). Thanks! Mozó (talk) 18:34, 19 April 2009 (UTC)
 * If I am not wrong, you can find it in the first pages of Homology by Mac Lane. (As to the proof, if you do it thinking to vector spaces, you have it in general). --pma (talk) 19:30, 19 April 2009 (UTC)
 * Mac Lane was a good idea! In Mac Lane, Birkhoff Algebra it is an exercise (p. 328). Resp., Mozó (talk) 21:27, 19 April 2009 (UTC)
 * On a different note, is the accented "o" in your username part of the Hungarian alphabet? Or is it supposed to be Spanish? -- PS T  03:26, 20 April 2009 (UTC)