Text Formatting ⇒ Double line in the title of theorem

[pourya]

Hi everybody,
There is a theorem which its title is long, and I can not break the title in two parts using ordinary next line commands, such as newline, linebreak, \\, ...
Does anybody have any suggestion

[frabjous]

Not without a minimal working example of what you mean, no.

[pourya]

Thanks, but there is no error using those commands, simply latex ignores the command.
The problem is still unsolved.

[frabjous]

What commands? What are you talking about?

That wasn't a link to a suggested solution. It was a link to a description of what you must post here before anyone will be able to help even try to help you.