Timeline for Is the cross-product of two subgroups another subgroup (as claimed in the following paper)?
Current License: CC BY-SA 2.5
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| Jun 24, 2010 at 19:26 | comment | added | The Mathemagician | @Jack First,physicists are generally notorious for not having total logical consistency in thier papers about mathematical topics. Secondly,taking direct products of groups,while the simplest and one of the most useful ways of generating new groups,does have interesting perils that aren't immediately obvious and this is a good example of this. | |
| Jun 24, 2010 at 13:28 | comment | added | Andrew Stacey | +1 particularly for the last paragraph! | |
| Jun 24, 2010 at 13:22 | history | answered | Jack Schmidt | CC BY-SA 2.5 |