Timeline for Number of endofunctions in [n] without fixed points with exactly k two-cycles
Current License: CC BY-SA 4.0
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Mar 8, 2022 at 16:05 | vote | accept | Sebastian K. | ||
| Mar 8, 2022 at 16:04 | comment | added | Sebastian K. | Thank you! I expected more elaborate theory to be required, but the inclusion-exclusion principle really does the job (should have remembered that one). I can ensure that the formula does not contain any typos, as it fits perfectly to numerical results. I am happy to provide a detailed explanation of the formula if someone should prefer that, but will of course mark the answer as sufficient. | |
| Mar 8, 2022 at 9:17 | history | answered | Peter Taylor | CC BY-SA 4.0 |