If we want to refer to "Lemma 3.4", we can write " Lemma \ref{number9}". Is there a command that the word "Lemma" or "Theorem" or ... appear automatic too? (i.e we write ... and in pdf appear "Lemma 3.4")
Welcome to TeX.SE! Yes it is possible. See e.g. https://tex.stackexchange.com/a/281224/121799.
– Feb 18 '19 at 03:23
Thank you very much. In fact, in my latex, the command "\cref" is enough.
– DarmanFeb 18 '19 at 03:44
I don't think this is a duplicate of the linked question since the problem in that question was that cleveref was loaded after the theorem environments were declared. It is likely a duplicate of this question though.
– CircumscribeFeb 18 '19 at 08:07
cleverefwas loaded after the theorem environments were declared. It is likely a duplicate of this question though. – Circumscribe Feb 18 '19 at 08:07