Talk:Fence (mathematics)
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Issues with equivalent conditions[edit]
I believe much of what is written in the section `Equivalent conditions' is incorrect.
Echoing this above, the statements in this section are in fact wrong. — Preceding unsigned comment added by 81.141.89.112 (talk) 14:44, 16 November 2021 (UTC)
Example request[edit]
An example of a fence would be a lovely addition to the article. Charibdis (talk) 00:09, 9 January 2011 (UTC)
Done. —David Eppstein (talk) 00:25, 9 January 2011 (UTC)
Commutative rings[edit]
Can you give examples of commutative rings of Krull dimension 1 for which the poset of prime ideals, ordered by inclusion, is a fence? GeoffreyT2000 (talk) 02:32, 5 May 2015 (UTC)
- You're the one who added Krull dimension to the article. Shouldn't you be the one to find sources and examples for that connection? —David Eppstein (talk) 03:10, 5 May 2015 (UTC)
- Well, I have several examples, such as discrete valuation rings. GeoffreyT2000 (talk) 04:29, 5 May 2015 (UTC)
- With sources? Please don't add material unless you can source it properly. —David Eppstein (talk) 04:50, 5 May 2015 (UTC)
- Well, I have several examples, such as discrete valuation rings. GeoffreyT2000 (talk) 04:29, 5 May 2015 (UTC)
Wrong counting sequence[edit]
Shouldn't the correct counting sequence be 1, 1, 1, 2, 5, 16, 61, 272, 1385, ... with reference to the OEIS sequence number A000111? This is half the number of alternating permutations (A001250). Also, the bijection between half of the alternating permutations and linear extensions of a fence is not immediately clear to me, even though there should be an easy argument. Torsten Mütze (talk) 16:26, 11 June 2019 (UTC)