how to mathematically prove that a cube consists of 11 nets?

Question

My math teacher and numerous online websites state that a cube has 11 nets. But none of them give a mathematical proof as to why that is. I believe this statement is not important enough for people to spend time into forming a proper proof. But I wonder if any of you math experts have the leisure to do so. 

Answer 1

I had never heard of this use of the word "net" and so I Googled the topic.

 

I find that this was discussed (and illustrated) 17 years ago.  See http://mathforum.org/library/drmath/view/54682.html