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Text and/or other creative content from this version of Partial order was copied or moved into Order theory with this edit on March 13, 2004. The former page's history now serves to provide attribution for that content in the latter page, and it must not be deleted as long as the latter page exists.
Order theory was one of the Mathematics good articles, but it has been removed from the list. There are suggestions below for improving the article to meet the good article criteria. Once these issues have been addressed, the article can be renominated. Editors may also seek a reassessment of the decision if they believe there was a mistake.
Why are "≤" or "≥" used in the article's definition(s)? Regarding two 2 ordered things, one is less than the other, or vice versa. And it's nonsense to ask if something is less or more than itself. — Preceding unsigned comment added by 108.41.98.105 (talk) 19:06, 4 January 2023 (UTC)[reply]
For total orders, it doesn't make a lot of difference which of these one uses. It is traditional to use ≤ for partial orders and < for (strict) weak orders; I don't know why. But for preorders, the = part of the ≤ relation is not equality, so in that case it is necessary to use ≤, to distinguish the case of two distinct elements that are both ≤ each other from the case of two incomparable elements. —David Eppstein (talk) 19:23, 4 January 2023 (UTC)[reply]
level-5 vital article is rated B-class on Wikipedia's content assessment scale.
