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I want to type k$\in$I as a subscript of \{$f_k$\} but am having trouble with

$\{$$f_k$$\}_{k$$\in$$ I}$

How should this be done?

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  • Welcome to TeX.SX! Your main error is to enter and exit from math mode: $k\in I$ is the correct input; for the subscript, $\{f_k\}_{k\in I}$
    – egreg
    Commented Nov 25, 2015 at 7:46

1 Answer 1

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Your error is going in and out of math mode: formulas should be typed as a single entity.

$\{f_k\}_{k\in I}$

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