User talk:1680168L

Username:1680168L

Wikipedia and sources
Hello, I'm DVdm. I noticed that you made one or more changes to an article, Four-valued logic, 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! If you need guidance on referencing, please see the referencing for beginners tutorial, or if you think I made a mistake, you can leave me a message on my talk page. Thank you. - DVdm (talk) 16:28, 19 July 2018 (UTC)