User talk:87.95.51.55

April 2023
Hello, I'm Materialscientist. I noticed that you made a change to an article, Gerhard Gentzen, but you didn't provide a source. I’ve removed it for now, but if you’d like to include a citation to a reliable source and re-add it, please do so! If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Materialscientist (talk) 09:56, 9 April 2023 (UTC)

Please do not add or significantly change content without citing verifiable and reliable sources. Before making any potentially controversial edits, it is recommended that you discuss them first on the article's talk page. Please review the guidelines at Citing sources and take this opportunity to add references to the article. Materialscientist (talk) 10:03, 9 April 2023 (UTC)