Earlier quoted context omitted.
I bet that your professor tried to write content from his own knowledge rather than strictly from published sources. The problem is that anyone can claim to be a math professor with expertise on graph theory. For this reason, everyone - even experts - need to cite sources in order to add content to Wikipedia.
Physicist here: I stopped making contributions to Wikipedia after a few edits and reversions, I stopped too. Furthermore, the danger that something I'd put a lot of time into could be replaced meant that it's not worth sinking a lot of time into it. The citation policy makes a ton of pragmatic sense, and I understand why it's there. It's an unfriendly way to meet the Wikipedia community. (an alternative way to addres…
You mean, "hey, I wrote it, you go look it up if you don't believe me?" Down that path lies madness. And Fox News.
Academics aren't supposed to have "trade secrets" by definition, because that impedes the teacher and researcher's motivation. Historically, anyway, by my understanding.