# How to make all the text in math mode non-italic [duplicate]

Possible Duplicate:
Is there a way to set math mode font non-italic?

I learned, that I can change the equation to not-italic, using $\mathrm{text}$. But how to make all the equations non-italic without adding \mathrm into all of them?

I tried \everymath{\mathrm}, but it failed.