[texhax] Plain TeX: a question about \par before and after displayed equations

[Rodolfo Medina]

Hi to all TeX users.

I wish to put a blank line before and after displayed equations, e.g.:


bla bla bla

$$x = y$$

bla bla


, but without being a new paragraph really begun.  In other words, I wish that
those two blank lines (before and after displayed equation) had no effect.  Is
that possible, and how?

Thanks for any help
Rodolfo