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answers:

1

in latex with \tilde{x} put ~ over x.
how I can put ~ down x ?

+2  A: 

The command \underset may help. tex.stackexchange.com would be another good place to ask, it's specialized in TeX and LaTeX.

Stefan
no is the best solution, but is a solution.
JuanPablo
An answer, using the undertilde package, has been given here: http://tex.stackexchange.com/questions/2329/sub-tilde-in-latex
Stefan