Projectively extended real line: Revision history

19 May 2025

• curprev 01:2101:21, 19 May 2025 Beland talk contribs m 20,186 bytes +6 custom spacing in math formulas (via WP:JWB) undo Tag: JWB

10 August 2023

• curprev 16:5116:51, 10 August 2023 Jacobolus talk contribs m 20,180 bytes −48 Undid revision 1169677726 by 2600:8805:D609:3800:4D6F:5853:F744:F54B (talk) – repeating this bold text just to substitute "system" for "line" here doesn't really seem worth the space, and we shouldn't make bold titles out of wikilinks undo Tag: Undo
• curprev 15:3715:37, 10 August 2023 2600:8805:d609:3800:4d6f:5853:f744:f54b talk 20,228 bytes +48 No edit summary undo Tag: Reverted

15 July 2023

• curprev 11:2411:24, 15 July 2023 Crisófilax talk contribs m 20,180 bytes +2 It's not enough that the RHS is defined. For example, in a(b+c)=ab+ac with a=inf, b=1, c=-1, the RHS is defined and equal to inf, but the LHS is undefined. undo Tags: Visual edit Mobile edit Mobile web edit Advanced mobile edit
• curprev 11:2411:24, 15 July 2023 D.Lazard talk contribs 20,178 bytes +24 Reverted 1 edit by Crisófilax (talk): Unnecessary, but possibly useful for non-experts undo Tags: Twinkle Undo
• curprev 11:1411:14, 15 July 2023 Crisófilax talk contribs m 20,154 bytes −24 Unnecessary since those operations are already defined in R undo Tags: Reverted Visual edit Mobile edit Mobile web edit Advanced mobile edit

20 June 2023

• curprev 15:3615:36, 20 June 2023 96.227.223.203 talk 20,178 bytes −6 Undid revision 1161084746 by 96.227.223.203 (talk) Temporary undo to avert edit war with unsavory individual undo Tag: Undo
• curprev 14:5314:53, 20 June 2023 96.227.223.203 talk 20,184 bytes +6 Undid revision 1161050442 by D.Lazard (talk) It is not confusing. Instead of baseless conjecture, it is perfectly within your realm of reasoning to trust another reasonably caring editor. undo Tags: Undo Reverted
• curprev 09:2309:23, 20 June 2023 D.Lazard talk contribs 20,178 bytes −6 Reverted good faith edits by 96.227.223.203 (talk): The emphasis on special values may be confusing undo Tags: Twinkle Undo Reverted
• curprev 06:3306:33, 20 June 2023 96.227.223.203 talk 20,184 bytes +6 Update image undo Tag: Reverted

24 May 2023

• curprev 00:2900:29, 24 May 2023 Quondum talk contribs 20,178 bytes +83 fmt undo

6 March 2023

• curprev 12:5412:54, 6 March 2023 Quasi-derivative talk contribs m 20,095 bytes +11 →Algebraic properties: added \left and \right to parentheses undo

22 February 2023

• curprev 19:0519:05, 22 February 2023 Citation bot talk contribs 20,084 bytes −70 Alter: url. URLs might have been anonymized. | Use this bot. Report bugs. | Suggested by AManWithNoPlan | #UCB_CommandLine undo

5 February 2023

• curprev 21:1721:17, 5 February 2023 Joel Brennan talk contribs m 20,154 bytes +377 "finite open intervals" -> "bounded open intervals", and added wikilinks undo

24 January 2023

• curprev 09:4809:48, 24 January 2023 D.Lazard talk contribs 19,777 bytes −53 →top: procedural rm of a merge tag: no discussion open, no tag in the other article undo
• curprev 05:0205:02, 24 January 2023 GünniX talk contribs m 19,830 bytes +29 Reflist undo Tag: AWB

23 January 2023

• curprev 17:3717:37, 23 January 2023 Jacobolus talk contribs 19,801 bytes −889 remove proliferation of {{cn}} tags. it is not helpful to readers to litter these after every sentence. Readers are not stupid can easily see that there are no footnotes here. feel free to research and add more references. If there is a specific claim that seems dubious, by all means ask for a reference (or take it to the talk page). undo

22 January 2023

• curprev 23:0323:03, 22 January 2023 Duckmather talk contribs 20,690 bytes +2,046 add citations, ce undo Tag: Visual edit

30 August 2022

• curprev 10:1310:13, 30 August 2022 132.231.140.164 talk 18,644 bytes +12 →Neighbourhoods undo

4 April 2022

• curprev 17:3117:31, 4 April 2022 Arjayay talk contribs m 18,632 bytes −3 Duplicate word removed undo

3 April 2022

• curprev 17:3217:32, 3 April 2022 D.Lazard talk contribs 18,635 bytes +61 →Neighbourhoods: more prose, {{math|}}, MOS:MAATH#TONE undo
• curprev 17:0417:04, 3 April 2022 D.Lazard talk contribs 18,574 bytes −50 Undid revision 1080810041 by Cewbot (talk) better to use the existing redirect undo
• curprev 16:0616:06, 3 April 2022 Cewbot talk contribs m 18,624 bytes −2 Fix broken anchor: 2014-09-14 #Punctured neighbourhood→Neighbourhood (mathematics)#Deleted neighbourhood undo

3 March 2022

• curprev 11:4911:49, 3 March 2022 D.Lazard talk contribs 18,626 bytes −19 Shorter and less technical undo
• curprev 10:2810:28, 3 March 2022 Chewings72 talk contribs m 18,645 bytes +86 Adding short description: "Extension of the set of the real numbers by a point denoted ∞" (Shortdesc helper) undo

18 September 2021

• curprev 02:1502:15, 18 September 2021 149.115.211.18 talk 18,559 bytes +9 →Extensions of the real line: clarification of terms undo Tags: Mobile edit Mobile app edit Android app edit
• curprev 02:1002:10, 18 September 2021 149.115.211.18 talk 18,550 bytes +16 →top: clarification of terms undo Tags: Mobile edit Mobile app edit Android app edit

15 June 2021

• curprev 10:0510:05, 15 June 2021 D.Lazard talk contribs 18,534 bytes −24 →See also: -1 (linked in the lead) undo
• curprev 10:0410:04, 15 June 2021 D.Lazard talk contribs 18,558 bytes −49 →See also: -2 (linked in the lead) undo
• curprev 10:0110:01, 15 June 2021 D.Lazard talk contribs 18,607 bytes −1 →top: typo + ce undo
• curprev 09:4309:43, 15 June 2021 D.Lazard talk contribs 18,608 bytes −14 →top: better link undo

14 June 2021

• curprev 23:3323:33, 14 June 2021 80.71.142.78 talk 18,622 bytes +27 →See also: add Real projective line (since we have so many similar articles) undo

9 February 2021

• curprev 13:2913:29, 9 February 2021 Hellacioussatyr talk contribs 18,595 bytes −15 →Basic definitions of limits: Removed italics for parentheses undo Tag: 2017 wikitext editor

24 December 2020

• curprev 05:5705:57, 24 December 2020 MarkH21 talk contribs 18,610 bytes −9 less imperative tone undo Tags: Mobile edit Mobile web edit Advanced mobile edit

24 November 2020

• curprev 11:1411:14, 24 November 2020 D.Lazard talk contribs 18,619 bytes −124 Reverted 4 edits by DrewPsiPi (talk): Do not replace standard notation by your own preference undo Tags: Twinkle Undo
• curprev 06:1406:14, 24 November 2020 DrewPsiPi talk contribs 18,743 bytes +76 →Dividing by zero: Fixed the notation, making the infinities unsigned. undo Tags: Reverted Mobile edit Mobile web edit
• curprev 06:1206:12, 24 November 2020 DrewPsiPi talk contribs 18,667 bytes +32 Pretty sure I’ve figured out how to add the Tilda onto the rest of the infinites to be sure they are unsigned. This is a notation fix. undo Tags: Reverted Mobile edit Mobile web edit
• curprev 06:0706:07, 24 November 2020 DrewPsiPi talk contribs 18,635 bytes +8 Fixed the same notation error in another tex. undo Tags: Reverted Mobile edit Mobile web edit
• curprev 06:0406:04, 24 November 2020 DrewPsiPi talk contribs 18,627 bytes +8 →Dividing by zero: This article makes mistakes regarding mathematical notation. The infinity used refers to positive infinity, in order to make it correct the infinity needs to be unsigned. The unsigned infinity has a Tilda above it. So I put a Tilda above the infinity. The other infinities should be changed too however I don’t know how as they aren’t tex just characters. undo Tags: Reverted Mobile edit Mobile web edit

13 July 2020

• curprev 09:1709:17, 13 July 2020 D.Lazard talk contribs 18,619 bytes −22 Editing revision 967373285 by Joel Brennan (talk) undo Tag: Undo

12 July 2020

• curprev 21:4821:48, 12 July 2020 Joel Brennan talk contribs m 18,641 bytes +24 No edit summary undo

15 June 2020

• curprev 08:2108:21, 15 June 2020 D.Lazard talk contribs 18,617 bytes −83 Reverted 1 edit by User125000 (talk): Rv changes from corrct HTML to partially incorrect latex (TW) undo Tag: Undo
• curprev 04:1804:18, 15 June 2020 User125000 talk contribs 18,700 bytes +83 No edit summary undo

26 March 2020

• curprev 11:1611:16, 26 March 2020 D.Lazard talk contribs 18,617 bytes +151 →Continuity: Adding polynomials that may be counterintuitive for beginners undo
• curprev 10:3210:32, 26 March 2020 Double sharp talk contribs 18,466 bytes +24 →Continuity: is there even a standard way to define sin(∞) or tan(∞)? if not, it should probably say that sin is continuous on R, but you can't choose any value for it to take at ∞ to make it continuous there too, same for tan undo
• curprev 10:2610:26, 26 March 2020 D.Lazard talk contribs 18,442 bytes +928 →Continuity: Clarifications that revert, in particular, my preceding revert, use of {{math}}, and other ce undo
• curprev 08:5508:55, 26 March 2020 D.Lazard talk contribs 17,514 bytes +8 →Continuity: typo that was probably the cause of the preceding erroneous reverted edit undo
• curprev 08:5008:50, 26 March 2020 D.Lazard talk contribs 17,506 bytes −9 Reverted 1 edit by Double sharp (talk): Tan is conti (TW) undo Tag: Undo
• curprev 08:0008:00, 26 March 2020 Double sharp talk contribs 17,515 bytes +9 →Continuity: since we just mentioned tan, I guess we should note that it is (pretty clearly) not continuous at infinity either undo

17 March 2019

• curprev 16:1416:14, 17 March 2019 BD2412 talk contribs m 17,506 bytes +27 →Geometry: Fixing links to disambiguation pages, improving links, other minor cleanup tasks undo Tag: AWB