It is common to place a `\qed`

-Box at the end of a theorem statement (or lemma, corollary, …) if we give no proof for that statement.

How can I do this in LaTeX? If I place a qed-box at the end of the statement there is an additional linebreak, which is inacceptable formating.

## Best Answer

if you are using

`amsthm`

or an ams document class, this problem is addressed by an item in the ams author faq. this in turn links to an example document (that's the input; the output is also present) that covers quite a few of the possible situations in which such a marker could be wanted. the most extreme situations require some manual effort, but i believe that nearly all reasonable possibilities (including the non-proof ending with a display) are covered.