Lyx/Latex beginner here. I'm using Lyx with an AMS article document class.
How do I add a new type of math environment such as Axiom? They have Theorem, Definition, Proposition, etc. but I want axiom, and I want it to be numbered (and possibly also a non-numbered version). I'd like it to popup in the environment menu in the top left under Reasoning just like Theorem and Definition do.
This answer does something related but it is a bit more involved than this and I can't figure out how to isolate the simple part from the other things they are doing there.