Timeline for Crossed module structure on homotopy groups
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 23, 2016 at 11:21 | history | edited | Ronnie Brown | CC BY-SA 3.0 |
added more intuition
|
| Jan 22, 2016 at 11:26 | history | edited | Ronnie Brown | CC BY-SA 3.0 |
added extra info and links
|
| Jun 22, 2011 at 10:59 | comment | added | Ronnie Brown | Another comment is that crossed modules classify pointed homotopy 2-types, which the chain complexes with operators do not. For explicit calculation of second homotopy groups see (with A. RAZAK SALLEH), `Free crossed crossed resolutions of groups and presentations of modules of identities among relations', LMS J. Comp. and Math. 2 (1999) 28-61. and there is actually a GAP program on calculating with crossed modules Wensley, C. and Alp, M.{ Xmod, a gap share package for computation with crossed modules}. {GAP Manual} What more do you want? | |
| Jun 22, 2011 at 10:21 | history | answered | Ronnie Brown | CC BY-SA 3.0 |