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how to type `f_(xy)` and `f_(x,x)`

PostPosted: Thu 24 March, 2011 07:35
by admin
to type `f_(xy)` use \`f_(xy)\`

for `f_(x,x)` use \`f_(x,x)\`. But if you don't want to have comma we can use escape character \ so the `f_(x\x)` is displayed using \`f_(x\x)\`