Timeline for sub ring of algebra over subfield
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Oct 19, 2013 at 23:35 | comment | added | Todd Trimble | If you need $a\notin B$, a counterexample is $A=k(a)[T]$, $B=k[T]+Tk(a)[T]$, $x=T$, $y=−aT$. – Kevin Ventullo Jul 20 '11 at 22:15 | |
| Jul 6, 2011 at 18:59 | comment | added | GH from MO | I might be missing something, but a counterexample to your first question is $A=B=k[a]$, $x=1$, $y=-a$. | |
| Jul 6, 2011 at 18:52 | history | edited | GH from MO | CC BY-SA 3.0 |
added 56 characters in body; edited body
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| Jul 6, 2011 at 17:36 | comment | added | Mariano Suárez-Álvarez | What rôle does $B$ play in your first paragraph? | |
| Jul 6, 2011 at 17:23 | history | asked | ventura | CC BY-SA 3.0 |