Nielsen–Schreier theorem: Revision history

15 October 2024

• curprev 07:4607:46, 15 October 2024 1AmNobody24 talk contribs m 13,392 bytes +4 added link(s) to Commentarii Mathematici Helvetici (via WP:JWB) undo

13 June 2024

• curprev 11:5911:59, 13 June 2024 Nilesj talk contribs 13,388 bytes +308 →Proof: reword for clarity and improve citation undo

12 June 2024

• curprev 20:0020:00, 12 June 2024 Nilesj talk contribs 13,080 bytes +395 →Proof: rewrite second part about index formula using Euler characteristic instead of homology undo

16 April 2024

• curprev 00:5700:57, 16 April 2024 DuncanHill talk contribs 12,685 bytes +2 Fix typos, fixes Category:Harv and Sfn no-target errors undo

20 October 2023

• curprev 08:5808:58, 20 October 2023 Citation bot talk contribs 12,683 bytes +21 Add: s2cid, authors 1-1. Removed parameters. Some additions/deletions were parameter name changes. | Use this bot. Report bugs. | Suggested by Abductive | #UCB_webform 2312/3841 undo

26 May 2023

• curprev 15:4115:41, 26 May 2023 81.101.238.199 talk 12,662 bytes +38 Add to category "Theorems in group theory" undo

21 May 2022

• curprev 12:2612:26, 21 May 2022 1234qwer1234qwer4 talk contribs m 12,624 bytes +2 →Proof: indent undo

8 February 2022

• curprev 21:1721:17, 8 February 2022 Raringo talk contribs m 12,622 bytes +1 →Example: Added space undo Tag: Visual edit

24 November 2021

• curprev 22:3922:39, 24 November 2021 Dabed talk contribs 12,621 bytes +29 →See also: Added Kurosh subgroup theorem undo Tag: Visual edit

23 August 2021

• curprev 19:0719:07, 23 August 2021 Sietse Snel talk contribs m 12,592 bytes +1 →History: fix mactutor citation parameter undo

30 July 2021

• curprev 04:4004:40, 30 July 2021 Citation bot talk contribs 12,591 bytes +21 Add: s2cid. | Use this bot. Report bugs. | Suggested by RoanokeVirginia | Category:CS1 errors: unsupported parameter | #UCB_Category 847/947 undo

23 December 2020

• curprev 18:1318:13, 23 December 2020 Monkbot talk contribs m 12,570 bytes −10 Task 18 (cosmetic): eval 14 templates: del empty params (1×); hyphenate params (4×); cvt lang vals (1×); undo Tag: AWB

2 November 2020

• curprev 22:1322:13, 2 November 2020 Deacon Vorbis talk contribs 12,580 bytes −14 →Proof: The intuitiveness of this is rather debatable undo

10 May 2020

• curprev 21:0921:09, 10 May 2020 ArnoldReinhold talk contribs 12,594 bytes +81 Adding local short description: "Theorem that every subgroup of a free group is itself free", overriding Wikidata description "theorem that every subgroup of a free group is itself free" (Shortdesc helper) undo

13 April 2020

• curprev 22:5522:55, 13 April 2020 OAbot talk contribs m 12,513 bytes +21 Open access bot: hdl added to citation with #oabot. undo

12 July 2019

• curprev 13:5813:58, 12 July 2019 Citation bot talk contribs m 12,492 bytes +48 Add: hdl, jstor. | You can use this bot yourself. Report bugs here.| Activated by User:Marianne Zimmerman undo

18 May 2019

• curprev 18:2518:25, 18 May 2019 MinusBot talk contribs m 12,444 bytes −33 Proper minus signs and other cleanup. Report bugs, errors, and suggestions at User talk:MinusBot undo Tag: AWB

10 May 2019

• curprev 16:4416:44, 10 May 2019 Auric talk contribs 12,477 bytes −2 →History undo
• curprev 16:4316:43, 10 May 2019 Auric talk contribs 12,479 bytes −2 →top undo

17 March 2019

• curprev 16:1316:13, 17 March 2019 BD2412 talk contribs m 12,481 bytes +27 →History: Fixing links to disambiguation pages, improving links, other minor cleanup tasks undo Tag: AWB

14 February 2019

• curprev 13:3213:32, 14 February 2019 Magyar25 talk contribs 12,454 bytes +34 →Proof: Add link to Homotopy Equivalence undo
• curprev 13:2913:29, 14 February 2019 Magyar25 talk contribs 12,420 bytes +19 No edit summary undo Tag: Visual edit

10 February 2019

• curprev 22:1722:17, 10 February 2019 Magyar25 talk contribs 12,401 bytes +44 No edit summary undo Tag: Visual edit
• curprev 22:0522:05, 10 February 2019 Magyar25 talk contribs 12,357 bytes +693 Add illustration to proof. undo Tag: Visual edit
• curprev 20:4420:44, 10 February 2019 52.144.34.243 talk 11,664 bytes −864 Correction to the subgroup example undo Tag: Visual edit
• curprev 15:2715:27, 10 February 2019 52.144.34.243 talk 12,528 bytes +12 →Proof undo
• curprev 15:2315:23, 10 February 2019 52.144.34.243 talk 12,516 bytes +900 Add proof of rank using Betti number undo Tag: Visual edit

6 June 2018

• curprev 19:2519:25, 6 June 2018 2601:807:8000:75f1:6d2a:8480:a6c6:8fae talk 11,616 bytes +1 →Proof: "Schreier" was misspelled. undo

14 March 2018

• curprev 19:1119:11, 14 March 2018 35.8.151.126 talk 11,615 bytes +10 →Proof undo

26 February 2018

• curprev 15:3315:33, 26 February 2018 Magyar25 talk contribs 11,605 bytes +134 →References undo

3 October 2016

• curprev 18:2018:20, 3 October 2016 Tea2min talk contribs 11,471 bytes +10 →Axiomatic foundations: Split reference. undo
• curprev 18:1818:18, 3 October 2016 Tea2min talk contribs 11,461 bytes +29 →References: Add author-link for Joseph J. Rotman. undo
• curprev 18:1018:10, 3 October 2016 Tea2min talk contribs 11,432 bytes 0 →Statement of the theorem: Fix own mistake. undo
• curprev 18:0918:09, 3 October 2016 Tea2min talk contribs 11,432 bytes +55 Author links for Michael D. Jordan and Moshe Jarden. undo

3 February 2016

• curprev 12:0512:05, 3 February 2016 Rjwilmsi talk contribs m 11,377 bytes −1 →References: Journal cites: format journal names, using AWB (11875) undo

9 October 2015

• curprev 12:0912:09, 9 October 2015 Zundark talk contribs 11,378 bytes +56 →Statement of the theorem: The index in the Schreier Index Formula needs to be finite (so it only quantifies some cases of the Nielsen–Schreier Theorem). undo

6 April 2015

• curprev 07:5907:59, 6 April 2015 66.74.176.59 talk 11,322 bytes +7 ce undo
• curprev 07:0807:08, 6 April 2015 ClaireWalzer talk contribs 11,315 bytes −5 Undid revision 655143537 by 66.74.176.59 (talk) Misspelling "Mathmatica" (sic) undo
• curprev 05:2105:21, 6 April 2015 66.74.176.59 talk 11,320 bytes +5 ce undo

25 July 2014

• curprev 07:0607:06, 25 July 2014 Atomspatz talk contribs 11,315 bytes 0 Corrected the formula undo

12 July 2014

• curprev 17:1617:16, 12 July 2014 David Eppstein talk contribs 11,315 bytes +324 →Proof: credit for the topological proof, similarity to Schreier's original proof, per email from Warren Dicks undo

21 June 2014

• curprev 21:0021:00, 21 June 2014 David Eppstein talk contribs 10,991 bytes +186 →Statement of the theorem: copyedit description of reduced words; describe how reduced words are multiplied; wikilink Index of a subgroup undo
• curprev 18:4718:47, 21 June 2014 Deltahedron talk contribs 10,805 bytes +312 →Statement of the theorem: Nielsen–Schreier formula, cite Fried & Jarden (2008) undo
• curprev 18:4218:42, 21 June 2014 Deltahedron talk contribs 10,493 bytes +295 →References: Fried & Jarden (2008) undo

20 May 2014

• curprev 06:5506:55, 20 May 2014 Rjwilmsi talk contribs m 10,198 bytes +26 →References: Added 1 doi to a journal cite using AWB (10193) undo

24 November 2013

• curprev 03:0403:04, 24 November 2013 David Eppstein talk contribs 10,172 bytes +186 see also Fundamental theorem of cyclic groups undo

21 May 2013

• curprev 08:0408:04, 21 May 2013 144.122.37.39 talk 9,986 bytes 0 →Statement of the theorem undo

20 April 2013

• curprev 19:5619:56, 20 April 2013 Yobot talk contribs m 9,986 bytes +41 →References: WP:CHECKWIKI error fixes - Replaced endash with hyphen in sortkey per WP:MCSTJR using AWB (9100) undo

8 March 2013

• curprev 20:3920:39, 8 March 2013 Addbot talk contribs m 9,945 bytes −110 Bot: Migrating 3 interwiki links, now provided by Wikidata on d:q1259814 undo

20 December 2012

• curprev 12:4012:40, 20 December 2012 דניאל ב. talk contribs 10,055 bytes +38 No edit summary undo