There is a difference between "understanding" and "agreeing". What gives you the right to call anyone a non-mathematician? You were the first to imply this of me. My suggestion to you is don't dish it out if you can't take it. To call someone a non-mathematician when it is false, is an attack on one's character. I returned your favour. Now, if what you claim is true, there were no real mathematicians until Levi-Civita came along. This smacks to me of Jewish superiority complex. 12.176.152.194