Timeline for Structures that turn out to exhibit a symmetry even though their definition doesn't
Current License: CC BY-SA 3.0
4 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jan 13, 2014 at 9:12 | comment | added | John Stillwell | It's even more surprising if you start with the inductive definitions of plus and times. The proof that $ab=ba$ comes as Proposition 72 in the first development of this theory, by Grassmann in 1861. | |
| Dec 15, 2013 at 4:51 | comment | added | Terry Tao | Indeed, this fails in general when $a,b$ are ordinals. | |
| S Dec 14, 2013 at 20:52 | history | answered | Dan Petersen | CC BY-SA 3.0 | |
| S Dec 14, 2013 at 20:52 | history | made wiki | Post Made Community Wiki by Dan Petersen |