LaTeX.org

Thanks, gmedina, it works! I will take the second choice since the theorems only have counters, no names.

I want to enclose the word "Theorem" with a box in an environment that I created by the \newtheorem command. Of course, with the counter. I do not want that the contents of the theorem are inside the box. I tried with \newtheorem{theo}{\fbox{Theorem}} but the box only encloses the word "Theorem" and ...