User talk:50.201.136.21

February 2018
Hello, I'm Samf4u. I wanted to let you know that I reverted one of your recent contributions —the one you made with this edit to Six-dimensional space— because it did not appear constructive. If you would like to experiment, please use the sandbox. If you think I made a mistake, or if you have any questions, you can leave me a message on my talk page. Thanks. Samf4u (talk) 16:20, 10 February 2018 (UTC)

February 2020
Hello, I'm Donner60. I noticed that you made a change to an article, Mario Negri, 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. Donner60 (talk) 04:09, 28 February 2020 (UTC)
 * If this is a shared IP address, and you did not make the edits referred to above, consider creating an account for yourself or logging in with an existing account so that you can avoid further irrelevant notices.