0.1
\newtheorem{thm}{Theorem} \newtheorem{prop}{Proposition} \newtheorm{conjec}{Conjecture} \newtheorem{wildshot}{Hypothesis} % make it sound good!
The first argument to \newtheorem
defines a new
theorem-like environment name of your own choosing. The second argument
contains the text that you want inserted when your theorem is
proclaimed:
0.1
\begin{thm} $X$ is normal if, and only if, each pair of disjoint closed sets in $X$ is completely separated. \end{thm} \begin{wildshot} % remember, we chose the name 'wildshot' The property of Moore extends to all objects of the class $\Sigma$. \end{wildshot}which will produce the following:
Notice that LATEX italicises the theorem statement, and that you still have to shift in to maths mode when you want to set symbols and expression. Typically, it is the style file that determines what a theorem will appear like—so don't go changing this if you are preparing for submission for publication (because the journal staff want to substitute their production style for your document style choice, and not be over-ridden by other commands).