Function (mathematics): Revision history

16 April 2024

• curprev 17:2817:28, 16 April 2024‎ Jacobolus talk contribs‎ 76,469 bytes +8‎ put back "exactly one", which I think was helpful here: we want to be clear and explicit that (a) there is at least one element of Y assigned, and (b) there is no more than one element of Y assigned. Including "exactly" is redundant but more emphatic and leaves no room for confusion undo

15 April 2024

• curprev 19:1419:14, 15 April 2024‎ JBW talk contribs‎ 76,461 bytes −1‎ Unnecessary comma undo
• curprev 19:1219:12, 15 April 2024‎ JBW talk contribs‎ 76,462 bytes +2‎ Restoring a word removed by mistake undo
• curprev 19:1019:10, 15 April 2024‎ JBW talk contribs‎ 76,460 bytes −8‎ Completing my last edit; I accidentally missed this part. undo
• curprev 19:0919:09, 15 April 2024‎ JBW talk contribs‎ 76,468 bytes −11‎ I don't see how "exactly one" conveys any more or better information than "one", and it does not, in general, assign one element of Y to every element of X: it may assign many different elements to different elements of X, but only one to each of them. undo
• curprev 10:4010:40, 15 April 2024‎ Felix Tritschler talk contribs‎ 76,479 bytes −1‎ →‎Inverse and implicit functions undo
• curprev 09:3009:30, 15 April 2024‎ Felix Tritschler talk contribs‎ 76,480 bytes +10‎ →‎Definition undo

11 April 2024

• curprev 12:3212:32, 11 April 2024‎ Jochen Burghardt talk contribs‎ 76,470 bytes −133‎ Undid revision 1218315355 by Cremastra (talk): there is nothing broken or red in the shorter version (might have been a temporary error of Wikipedia?) undo Tag: Undo
• curprev 00:0900:09, 11 April 2024‎ Cremastra talk contribs‎ 76,603 bytes +133‎ Reverting edit(s) by Jacobolus (talk) to rev. 1215352241 by D.Lazard: Reverting good faith edits – broke something, lots of big red error messages (RW 16.1) undo Tags: RW Undo Reverted

24 March 2024

• curprev 17:3517:35, 24 March 2024‎ Jacobolus talk contribs‎ 76,470 bytes −133‎ →‎top: this vertical bar notation still seems out of scope and distracting in the lead section, especially since it is not discussed or used later in the article undo Tag: Reverted
• curprev 16:4216:42, 24 March 2024‎ D.Lazard talk contribs‎ 76,603 bytes +420‎ →‎top: Paragraph about function evaluation rewritten. See talk (soon) undo
• curprev 14:3514:35, 24 March 2024‎ Jacobolus talk contribs‎ 76,183 bytes −490‎ this vertical bar evaluation notation seems out of scope for the lead of this article, and putting it here is confusing/distracting. let's just take it out undo
• curprev 13:4213:42, 24 March 2024‎ AnomieBOT talk contribs‎ m 76,673 bytes +16‎ Dating maintenance tags: {{Cn}} undo
• curprev 13:2213:22, 24 March 2024‎ Jochen Burghardt talk contribs‎ 76,657 bytes +53‎ →‎top: re-adding ((cn)) for \vert notation, for now, since it is not used elsewhere in this article (maybe it should be explained in the body, and the ((cn)) should go there) undo

22 March 2024

• curprev 17:4417:44, 22 March 2024‎ D.Lazard talk contribs‎ 76,604 bytes +1‎ →‎top: + full stop undo
• curprev 16:5716:57, 22 March 2024‎ MrOllie talk contribs‎ 76,603 bytes −22‎ Reverted 1 edit by Thatwhichislearnt (talk): Clearly not vandalism undo Tags: Twinkle Undo
• curprev 16:5616:56, 22 March 2024‎ Thatwhichislearnt talk contribs‎ 76,625 bytes +22‎ Undid revision 1214996233 by D.Lazard (talk) Reverting vandalism that removed tag and period ending sentence. undo Tags: Undo Reverted
• curprev 14:1814:18, 22 March 2024‎ D.Lazard talk contribs‎ 76,603 bytes −22‎ misplaced tag (I consider it as non-useful, but, if needed, it must be just after the definition of the notation) undo Tag: Reverted
• curprev 14:0414:04, 22 March 2024‎ Jochen Burghardt talk contribs‎ 76,625 bytes −10‎ →‎top: depending on the equivalence relation considered, any two things can be equivalent; suggest "equals" as a replacement (I'd prefer "evaluates to", but this may be confused with "function evaluation") undo
• curprev 13:1813:18, 22 March 2024‎ Thatwhichislearnt talk contribs‎ 76,635 bytes +5‎ Undid revision 1214874430 by D.Lazard (talk) undo Tag: Undo

21 March 2024

• curprev 18:5118:51, 21 March 2024‎ D.Lazard talk contribs‎ 76,630 bytes −5‎ Reverted 1 edit by UsernamesEndedYearsAgo (talk): "Expressions do not "result in" things", but operations do undo Tags: Twinkle Undo Reverted
• curprev 18:4418:44, 21 March 2024‎ UsernamesEndedYearsAgo talk contribs‎ 76,635 bytes +5‎ Incorrect parentheses use. Expressions do not "result in" things. undo Tag: Reverted

14 March 2024

• curprev 14:3914:39, 14 March 2024‎ MrOllie talk contribs‎ 76,630 bytes −388‎ Restored revision 1213679097 by Malparti (talk): You must get talk page agreement to proceed undo Tags: Twinkle Undo
• curprev 14:3614:36, 14 March 2024‎ Thatwhichislearnt talk contribs‎ 77,018 bytes +388‎ →‎Formal definition: Another go, addressing/dispelling the supposed concern. undo Tag: Reverted
• curprev 13:5213:52, 14 March 2024‎ Malparti talk contribs‎ 76,630 bytes −342‎ Undid revision 1213678490 by Thatwhichislearnt (talk) rv dubious edit — what are you trying to achieve exactly? undo Tag: Undo
• curprev 13:4713:47, 14 March 2024‎ Thatwhichislearnt talk contribs‎ 76,972 bytes +342‎ Undid revision 1213677577 by D.Lazard (talk) Stop edit warring. undo Tags: Undo Reverted
• curprev 13:4013:40, 14 March 2024‎ D.Lazard talk contribs‎ 76,630 bytes −342‎ Reverted 1 edit by Thatwhichislearnt (talk): Inconsistent definition; see talk undo Tags: Twinkle Undo Reverted
• curprev 12:0912:09, 14 March 2024‎ Thatwhichislearnt talk contribs‎ 76,972 bytes +342‎ Undid revision 1213660909 by D.Lazard (talk) Discuss first in talk. This is supported by references. undo Tags: Undo Reverted
• curprev 10:5510:55, 14 March 2024‎ D.Lazard talk contribs‎ 76,630 bytes −342‎ Reverted 1 edit by Thatwhichislearnt (talk): Use of undefined X and Y in a definition undo Tags: Twinkle Undo Reverted
• curprev 10:1410:14, 14 March 2024‎ Thatwhichislearnt talk contribs‎ 76,972 bytes +342‎ →‎Formal definition: Same content, same intent, but being as precise as Halmos. undo Tag: Reverted

13 March 2024

• curprev 21:3121:31, 13 March 2024‎ Cbigorgne talk contribs‎ 76,630 bytes −1‎ →‎Partial functions: fix notation of zeta function undo
• curprev 19:2319:23, 13 March 2024‎ D.Lazard talk contribs‎ 76,631 bytes +20‎ →‎Partial functions: see talk undo
• curprev 19:0119:01, 13 March 2024‎ David Eppstein talk contribs‎ 76,611 bytes +521‎ Undid revision 1213544411 by Kamil Kielczewski (talk) tendentious, WP:TECHNICAL undo Tag: Undo
• curprev 17:5717:57, 13 March 2024‎ Kamil Kielczewski talk contribs‎ 76,090 bytes −521‎ Undid revision 1213492383 by D.Lazard (talk) No sources! Probably because this change is a "revised" version (personal invention) of the well-known Bourbaki definition (a function is three sets) from the withdrawn edit 01:49, 11 March 2024. undo Tags: Undo Reverted
• curprev 11:3711:37, 13 March 2024‎ D.Lazard talk contribs‎ 76,611 bytes +521‎ →‎Formal definition: tentative for clarifying ambiguities that led to endless discussions on the talk page undo Tag: Reverted
• curprev 10:4210:42, 13 March 2024‎ D.Lazard talk contribs‎ 76,090 bytes +101‎ →‎Formal definition: Explaining why relations are introduced and why the formal and the informal definitions are essentially the same undo

11 March 2024

• curprev 17:2517:25, 11 March 2024‎ Thatwhichislearnt talk contribs‎ m 75,989 bytes +2‎ →‎Injective, surjective and bijective functions: Yet another "any" that can make the statement incorrect. undo
• curprev 17:2217:22, 11 March 2024‎ Thatwhichislearnt talk contribs‎ m 75,987 bytes +4‎ →‎Injective, surjective and bijective functions: Another two uses of "any" that make the statement incorrect or not, depending on the two meanings of "any" read. undo
• curprev 16:5816:58, 11 March 2024‎ D.Lazard talk contribs‎ 75,983 bytes +35‎ →‎top: minor clarification undo
• curprev 16:3516:35, 11 March 2024‎ Thatwhichislearnt talk contribs‎ m 75,948 bytes +8‎ →‎Partial functions: "any", in English, means **both** "all" and "some". It should **not** be used in Mathematics as a replacement for the logical quantifiers, since it does not determine which one it is. undo
• curprev 10:0010:00, 11 March 2024‎ D.Lazard talk contribs‎ 75,940 bytes −3,197‎ Reverted 1 edit by Kamil Kielczewski (talk): Here is a clear consensus on the talk page against this change undo Tags: Twinkle Undo
• curprev 01:4901:49, 11 March 2024‎ Kamil Kielczewski talk contribs‎ 79,137 bytes +3,197‎ →‎Formal definition: introduction of a more general but simpler version of the formal definition (without the problem of surjectivity) along with citations undo Tag: Reverted

5 March 2024

• curprev 21:5021:50, 5 March 2024‎ Jochen Burghardt talk contribs‎ 75,940 bytes +3‎ →‎Partial functions: tried to improve grammar undo
• curprev 12:1712:17, 5 March 2024‎ D.Lazard talk contribs‎ 75,937 bytes +2,872‎ →‎Partial functions: New section undo

28 February 2024

• curprev 10:5210:52, 28 February 2024‎ Rick Norwood talk contribs‎ 73,065 bytes −76‎ restore stable version undo Tag: Manual revert
• curprev 10:2910:29, 28 February 2024‎ Christine kejser talk contribs‎ 73,141 bytes +76‎ No edit summary undo Tag: Reverted
• curprev 10:2610:26, 28 February 2024‎ D.Lazard talk contribs‎ 73,065 bytes −54‎ Reverted 1 edit by Christine kejser (talk): Vandalism undo Tags: Twinkle Undo
• curprev 09:4809:48, 28 February 2024‎ Christine kejser talk contribs‎ 73,119 bytes +54‎ No edit summary undo Tag: Reverted
• curprev 09:4509:45, 28 February 2024‎ ClueBot NG talk contribs‎ m 73,065 bytes −54‎ Reverting possible vandalism by Christine kejser to version by Gatemansgc. Report False Positive? Thanks, ClueBot NG. (4303687) (Bot) undo Tag: Rollback
• curprev 09:4509:45, 28 February 2024‎ Christine kejser talk contribs‎ 73,119 bytes +54‎ No edit summary undo Tags: Manual revert Reverted