beamer provides a means to modify the start and end of a
theorem environment by setting the appropriate template. The start of the
theorem environment template is defined within
theorem begin, and the end in the template
This is a very important theorem and requires an exceptional proof.
\inserttheoremheadfont formats the header as
\bfseries. If you want to modify this (and add some colour or perhaps even a different style (
\itshape, say), input it directly as needed. Ending in
\normalfont switches back to the normal font shape for typesetting the remainder of the
\inserttheoremnumber inserts the theorem number. Whatever is specified as the optional argument to
theorem is considered as a "theorem addition", and is inserted using
\inserttheoremaddition. Punctuation, if any, is provided by
\insertpunctuation (default is a period
The redefinition of
theorem end is also required. In this case, it is left empty.