Some Mathematical notation for users
Math Symbols
In the codes below remove the space after the & to make them work (and also remove the quotes " ").
"x& sup3;" > x cubed
"x& sup2;" > x squared
"& le;" > less than or equal to
"& ge;" > greater than or equal to
"& gt;" > greater than
"& lt;" > less than
"& sube;" > subset of
"& int;" > integral sign
"& sum;" > uppercase Sigma notation for sum
"& infin;" > infinity
"& rArr;" > implies
"& hArr;" > if and only if
"& forall;" > for all
"& exist;" > there exists
"& isin;" > membership relation
"& lowast;" > *
"& there4;" > therefore
"& sim;" > similar to
"& deg;" > degrees (as in 45 degrees)
"& plusmn;" > plus or minus
Greek letters: simply use their normal names as in "& alpha;"
"& copy;" > copyright
More code references:  http://tinyurl.com/ffl5g  http://tinyurl.com/yrnyuz
See also:
http://tlt.its.psu.edu/suggestions/international/bylanguage/mathchart.html
subscripts?
