\text
command allows no formatting of text other than
the use of
spacing entities. Dollar sign
delimited math can be nested in \text material.
Note that thin spaces should be put around the text to separate it from the symbols around the text.
f(x) = 1 \text{\,for almost all\,} x
The spacing works out a little better if the right side of the expression becomes a one-row array.
f(x) = \array{ 1 & \text{for almost all}& x }More information on these commands may be found in Sec. 6.4 of the WebTeX documentation.
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