Possible Duplicate:
How can I prevent LaTeX from breaking inline formulas globally?
How do I keep a string of text together without it doing a line break?
So I have code like (sorry for russian):
Если на полуплоскость действует касательное усилие $T=P_{x} \delta (x-c)$, а нормальная нагрузка $N$ отсутствует, тогда на основании соотношений \eqref{eq1}, \eqref{eq2}, получаем:
Which renders like:

So I wonder how to make $T=P_{x} \delta (x-c)$ stay on some line ( one with text top or bottom )?
\mbox{}there will be no breaks int he formula. If you want it on its own line and centered thatn use display mode by surrounding it with\[ \]. – Peter Grill Apr 09 '12 at 18:20\relpenalty=10000\binoppenalty=10000, see: http://tex.stackexchange.com/questions/51263/what-are-penalties-and-which-ones-are-defined – Marco Daniel Apr 09 '12 at 18:30$\mbox{T=P_{x}\delta(x-c)}$but it does not compile =( – user1078642 Apr 09 '12 at 18:50\mbox{$T=P_{x}\delta(x-c)$}, since\mboxreverts its contents into text mode requiring you to force math mode via$...$again. – Werner Apr 10 '12 at 22:50