While it's not something usual, I've noticed that sometimes people edit my question or answer with a more complex notation or incorrect information/formulas. While I don't think this is done with malicious intent, it has sometimes confused people when I'm either asking or explaining something, as I don't always notice that my post has been edited with such radical changes.
What is the best course of action to take in this case? Is there a way to block a question/answer so it can only by edited with my approval? And hopefully it doesn't happen but, if someone edits an answer with blatant incorrect information, is it possible to report that person?