As a mathematician I'm particularly interested on
his contributions to see
why (if they were correct) were removed and think of possible reasons, but
again, no user with that username
Sorry I got it wrong. My username on the English wikipedia is Herve661.
And the contribution that was deleted is:
http://en.wikipedia.org/w/index.php?title=Mathematics&diff=prev&old…
Thanks for the replies, everyone.