User talk:42.110.137.164

October 2019
Hello, I'm Jschnur. I noticed that you added or changed content in an article, Cartesian coordinate system, but you didn't provide a reliable source. It's been removed and archived in the page history for now, but if you'd like to include a citation and re-add it, please do so. You can have a look at the tutorial on citing sources, or if you think I made a mistake, you can leave me a message on my talk page. Thank you. Jschnur (talk) 20:18, 22 October 2019 (UTC)
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