Timeline for Boolean rings with many automorphisms
Current License: CC BY-SA 4.0
3 events
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| Oct 21 at 11:23 | comment | added | YCor | A variant using $A=P(\omega)/$fin is: for any $f\in \mathrm{Hom}(A,\mathbf{Z}/2\mathbf{Z})$, $R_f=\mathrm{Ker}(f)$. Topologically, this corresponds to: given the point $x$ determined by $f$ in $\beta^*\omega$ (Stone-Cech remainder), $R_f$ is the set of clopen subsets of $\beta^*\omega$ not containing $x$. | |
| Oct 21 at 11:17 | comment | added | YCor | (Note that this example of $R$ is countable, and it can be shown to be the only one up to isomorphism.) | |
| Oct 21 at 3:48 | history | answered | YCor | CC BY-SA 4.0 |