anyone knows the meaning of the marked symbol in the pic and its Latex syntax?
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Some context would be helpful. – Gerard Oct 26 '13 at 09:03
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1It is the function which is $1$ if $x_1=j$ and $0$ otherwise. – André Nicolas Oct 26 '13 at 09:07
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It is an indicator function that is 1 if its argument is true and 0 if it is false. The latex syntax is $\mathbb{I}$ (\mathbb{I}).
Riemann1337
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