This article is rated Start-class on Wikipedia's content assessment scale. It is of interest to the following WikiProjects:

Biography: Science and Academia This article is within the scope of WikiProject Biography, a collaborative effort to create, develop and organize Wikipedia's articles about people. All interested editors are invited to join the project and contribute to the discussion. For instructions on how to use this banner, please refer to the documentation.BiographyWikipedia:WikiProject BiographyTemplate:WikiProject Biographybiography articles This article is supported by the science and academia work group. Israel Low‑importance This article is within the scope of WikiProject Israel, a collaborative effort to improve the coverage of Israel on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.IsraelWikipedia:WikiProject IsraelTemplate:WikiProject IsraelIsrael-related articles Low This article has been rated as Low-importance on the project's importance scale. Project Israel To Do: history watch purge Here are some tasks awaiting attention: Assess : Rate the Unassessed Israel-related articles and Unknown-importance Israel-related articles. Categorization : Diffuse articles from Category:Companies of Israel. Cleanup : Cleanup listing for this project is available. See also the list by category and the tool's wiki page. Collaborate : Participate in WikiProject Israel Palestine Collaboration. Copyedit : Timeline of the Israeli–Palestinian conflict in 2005 Deletion sorting : Participate in discussions at WikiProject Deletion sorting/Israel. Expand : Ayala Procaccia, Diamond industry in Israel, Edna Arbel, Levin Kipnis, Rami Kleinstein, Sephardic Haredim, Zman Tel Aviv, Nachum Heiman, Public Defence (Israel), Prisoner of Zion, Trial of Benjamin Netanyahu, Day to Mark the Departure and Expulsion of Jews from the Arab Countries and Iran, Pre-Modern Aliyah See also Articles needing translation from Hebrew Wikipedia. Geographical coordinates : Add geographic coordinates to Israel articles missing geocoordinate data. Infobox : Add infoboxes to Israel articles needing infoboxes. Maintain : See Israel articles needing attention. Map : See discussion at Module:Location map/data/Israel. Add maps to articles in Wikipedia requested maps in Israel. NPOV : Jewish exodus from Arab and Muslim countries Photo : Add pictures to articles in Wikipedia requested photographs in Israel. Stubs : See Israel stubs. Update : Basic Law proposal: Israel as the Nation-State of the Jewish People Other : Translate to Hebrew : David Bar-Hayim, Guy Bavli, and Guy Oseary. Merge Nahal Rafiah ( draft, heb) into Nahal as requested by Wikipedia authority

I see the corresponding article in German: [1], but fail to make an interwiki link to it from here. Boris Tsirelson ( talk) 13:27, 21 July 2014 (UTC) reply

"Tsirelson is known for undoing other people's Wikiedia edits without explaining his reasons for doing so." This phrase is added by User:Daqu just after he "Added the fact that this Cantor set is homeomorphic to the middle-thirds Cantor set" to " Smith–Volterra–Cantor set", and I thanked him for this addition and added wikilink to "Homeomorphism" to his words "topologically equivalent". Very puzzling. I was never so much puzzled by another wikipedian. I would be glad to see his reason explained. Boris Tsirelson ( talk) 06:23, 14 December 2014 (UTC) reply

Now I am looking at my "Contributions": maybe I forgot some undoing? The last undoing by me was on Dec 2, "Topological space", with edit summary "not an "interesting question"; just (4) above; and anyway, ask questions on the talk page, not here." Did not I explain my reason? Is "176.92.153.87" another name of Daqu? Highly puzzling. Boris Tsirelson ( talk) 06:29, 14 December 2014 (UTC) reply

Now emeritus, see Tsirelson's homepage. Boris Tsirelson ( talk) 05:55, 26 October 2017 (UTC) reply

High grade cancer diagnosed: fall 2019.

Voluntary assisted death: January 2020, Pegasos, Switzerland.

(But wait for reliable source, of course.). Happy editing (and ultimately, happy exiting, if you like). Boris Tsirelson ( talk) 20:54, 20 January 2020 (UTC) reply

For those edit warring on this article: please respect the last wishes of Boris Tsirelson, and wait for reliable sources. His talk page is not one. Tercer ( talk) 12:00, 23 February 2020 (UTC) reply

Sadly, this is now confirmed by a RS (with the article appropriately updated). -- JBL ( talk) 16:56, 26 February 2020 (UTC) reply

Since he was a Wikipedian, obituary added to Wikipedia:Deceased Wikipedians. Kirbanzo ^{( userpage -  talk -  contribs)} 21:18, 6 March 2020 (UTC) reply

Tsirel added himself to Wikipedia:Notable people who have edited Wikipedia in November 2008: diff. It's also on his user page, see March 2007. Johnuniq ( talk) 10:17, 7 September 2020 (UTC) reply