Timeline for How to compute second homology of a group given by presentation with two relators
Current License: CC BY-SA 3.0
5 events
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| Nov 16, 2015 at 15:50 | history | edited | David A. Jackson | CC BY-SA 3.0 |
I added another example.
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| Nov 15, 2015 at 19:08 | comment | added | Samarkand | Dear David, I know this. The question is how to construct presentations of different groups having $H_2 = Z^2$ | |
| Oct 24, 2015 at 6:16 | comment | added | HJRW | It's true H_2 is in general not computable from a presentation. This is s theorem of Cameron Gordon. Of course, the examples that show this have many more than 2 relations. The reference is: C. McA. Gordon. Some embedding theorems and undecidability questions for groups. In Combinatorial and geometric group theory (Edinburgh, 1993), vol- ume 204 of London Math. Soc. Lecture Note Ser., pages 105–110. | |
| Oct 23, 2015 at 20:58 | history | edited | David A. Jackson | CC BY-SA 3.0 |
Fix grammar
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| Oct 23, 2015 at 19:25 | history | answered | David A. Jackson | CC BY-SA 3.0 |