![]() | Telephone number (mathematics) has been listed as one of the
Mathematics good articles under the
good article criteria. If you can improve it further,
please do so. If it no longer meets these criteria, you can
reassess it. Review: December 6, 2022. ( Reviewed version). |
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![]() | A fact from Telephone number (mathematics) appeared on Wikipedia's
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Did you know column on 26 April 2012 (
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Reading this article got me thinking and I just have one question: According to the article the nth telephone number is the number of self-inverse permutations on n elements. If I'm not mistaken, a self-inverse permutation on n elements is essentially an n by n matrix such that every line and every column contains exactly one 1 entry and only 0's otherwise. Accordingly, there should be according to this sequence only 4 such 3 by 3 matrices. However, I was able to find 6:
Could you tell me what my mistake was?-- Carabinieri ( talk) 21:31, 30 March 2012 (UTC)
The only "telephone number" that is also an actual US telephone number is 4809701440, and it apparently belongs to Studio Bravo Gary Babb. 68.44.132.25 ( talk) 05:23, 22 February 2013 (UTC)
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edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
140.213.191.65 ( talk) 21:50, 24 June 2021 (UTC)
GA toolbox |
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Reviewing |
Reviewer: Praseodymium-141 ( talk · contribs) 08:51, 6 August 2022 (UTC)
Hello, I'll be reviewing this article. 141 Pr 08:51, 6 August 2022 (UTC)
1a: No typographical errors seen, pass.
1b: No comments yet.
2a: No comments yet.
2b: These sources are fine, but I'm not sure that this is the only information available. Can you please tell me if this is all the information available. I'll put this and 3a as a pass if it is fine.
2c: No comments yet.
2d: No comments yet.
3a: No comments yet.
3b: No comments yet.
4: I haven't found any bias, probably pass.
5: According to this article's history, there have been no edit wars since 2018. I'll put this as a pass.
6a: No copyright issues seen, pass.
6b: This is not a big problem, but I would suggest to move the pictures up a bit, so that it won't go into the next section. This is optional though, so you don't have to do it. 141 Pr 10:03, 29 September 2022 (UTC)
Others:
@ Praseodymium-141: Except for a couple of brief questions that don't really address the GA criteria, there has been no review since you agreed to take this on 2 1/2 months ago. When can I expect a review? — David Eppstein ( talk) 16:12, 21 October 2022 (UTC)
Alright. Less busy this week, and it's a short enough article, so should be done by tomorrow. Ovinus ( talk) 04:57, 3 December 2022 (UTC)
Few comments overall. I'll update you after tomorrow's ferment. Ovinus ( talk) 03:28, 4 December 2022 (UTC)
Please check the first sentence:
Shouldn't be 'sequences' there?
-- (non-English speaker) CiaPan ( talk) 07:34, 13 August 2022 (UTC)
![]() | Telephone number (mathematics) has been listed as one of the
Mathematics good articles under the
good article criteria. If you can improve it further,
please do so. If it no longer meets these criteria, you can
reassess it. Review: December 6, 2022. ( Reviewed version). |
![]() | Editing of this page by
new or
unregistered users is currently
disabled. See the protection policy and protection log for more details. If you cannot edit this page and you wish to make a change, you can request unprotection, log in, or create an account. |
![]() | A fact from Telephone number (mathematics) appeared on Wikipedia's
Main Page in the
Did you know column on 26 April 2012 (
check views). The text of the entry was as follows:
| ![]() |
![]() | This ![]() It is of interest to the following WikiProjects: | ||||||||||
|
Reading this article got me thinking and I just have one question: According to the article the nth telephone number is the number of self-inverse permutations on n elements. If I'm not mistaken, a self-inverse permutation on n elements is essentially an n by n matrix such that every line and every column contains exactly one 1 entry and only 0's otherwise. Accordingly, there should be according to this sequence only 4 such 3 by 3 matrices. However, I was able to find 6:
Could you tell me what my mistake was?-- Carabinieri ( talk) 21:31, 30 March 2012 (UTC)
The only "telephone number" that is also an actual US telephone number is 4809701440, and it apparently belongs to Studio Bravo Gary Babb. 68.44.132.25 ( talk) 05:23, 22 February 2013 (UTC)
![]() | This
edit request has been answered. Set the |answered= or |ans= parameter to no to reactivate your request. |
140.213.191.65 ( talk) 21:50, 24 June 2021 (UTC)
GA toolbox |
---|
Reviewing |
Reviewer: Praseodymium-141 ( talk · contribs) 08:51, 6 August 2022 (UTC)
Hello, I'll be reviewing this article. 141 Pr 08:51, 6 August 2022 (UTC)
1a: No typographical errors seen, pass.
1b: No comments yet.
2a: No comments yet.
2b: These sources are fine, but I'm not sure that this is the only information available. Can you please tell me if this is all the information available. I'll put this and 3a as a pass if it is fine.
2c: No comments yet.
2d: No comments yet.
3a: No comments yet.
3b: No comments yet.
4: I haven't found any bias, probably pass.
5: According to this article's history, there have been no edit wars since 2018. I'll put this as a pass.
6a: No copyright issues seen, pass.
6b: This is not a big problem, but I would suggest to move the pictures up a bit, so that it won't go into the next section. This is optional though, so you don't have to do it. 141 Pr 10:03, 29 September 2022 (UTC)
Others:
@ Praseodymium-141: Except for a couple of brief questions that don't really address the GA criteria, there has been no review since you agreed to take this on 2 1/2 months ago. When can I expect a review? — David Eppstein ( talk) 16:12, 21 October 2022 (UTC)
Alright. Less busy this week, and it's a short enough article, so should be done by tomorrow. Ovinus ( talk) 04:57, 3 December 2022 (UTC)
Few comments overall. I'll update you after tomorrow's ferment. Ovinus ( talk) 03:28, 4 December 2022 (UTC)
Please check the first sentence:
Shouldn't be 'sequences' there?
-- (non-English speaker) CiaPan ( talk) 07:34, 13 August 2022 (UTC)