Timeline for Curious identity involving the number of perfect matchings of the complete graph
Current License: CC BY-SA 4.0
16 events
| when toggle format | what | by | license | comment | |
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| Nov 12, 2023 at 12:02 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Jul 15, 2023 at 11:08 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Mar 17, 2023 at 11:01 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Nov 17, 2022 at 11:00 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Oct 18, 2022 at 12:29 | comment | added | Tom Copeland | @PeterTaylor, found the problem. Logging in for editing on the OEIS doesn't allow you to see the email button on any user page--you must also log in to your own user page to see it on your user page and others'. | |
| Oct 18, 2022 at 10:51 | answer | added | Peter Taylor | timeline score: 1 | |
| Oct 18, 2022 at 10:02 | comment | added | Peter Taylor | @TomCopeland, maybe you need to finish setting up your profile on the wiki. Now that I'm back from holiday and not using a phone browser, here's a screenshot. Alternatively, there's a general page at oeis.org/wiki/Special:EmailUser | |
| Oct 12, 2022 at 20:56 | comment | added | Fedor Petrov | Using factorization ${n+1\choose 2}-{k\choose 2}=(n-k+1)(n+k)/2$ you easily verify your formula. Combinatorial proof seems to be more tricky. | |
| Oct 12, 2022 at 11:12 | comment | added | Tom Copeland | @PeterTaylor, no such button has ever appeared in my browser in the tool section or elsewhere on PB's user page. | |
| Oct 12, 2022 at 6:16 | comment | added | Peter Taylor | @TomCopeland, sdd: the way to contact an OEIS contributor is via the wiki. If you log in and go to a user page, there is a link "Email this user" in the "Tools" section of the left column. | |
| Oct 12, 2022 at 0:43 | comment | added | sdd | Thanks. I was just thinking that this should be easy to prove, but I cannot do it. | |
| Oct 11, 2022 at 22:30 | comment | added | Tom Copeland | Peter Bala has made many contributions to the OEIS that overlap with my interests, but I have found no contact info for him. You might try emailing Sloane and requesting CI from him. | |
| Oct 11, 2022 at 21:41 | comment | added | sdd | @TomCopeland I have checked and this formula is indeed there, but I cannot find a way to contact the person who entered it there (Peter Bala). | |
| Oct 11, 2022 at 21:07 | comment | added | Tom Copeland | Have you checked oeis.org/A000680? Also look at (2n)!/(2^n n!), i.e., oeis.org/A001147, more often associated with perfect matchings of the complete graphs. | |
| Oct 11, 2022 at 20:11 | history | edited | sdd | CC BY-SA 4.0 |
deleted 1 character in body
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| Oct 11, 2022 at 20:03 | history | asked | sdd | CC BY-SA 4.0 |
