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I am typing the equation with \textbackslash inside as follows. It displays error "underfined control sequence". Can anyone explain me what the problem is? Thanks.

Here $x\in [0,\infty]^n$ \textblackslash  $\{1\}$. I got error "Undefined control sequence.

Here a \textbackslash b. This line is OK.
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you have

\textblackslash

"black" should be "back". A simple typo.

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  • oh, why i didn't recognize it. The error message of latex doesn't give me any hint. Thanks a lot friend! Jan 10 '14 at 17:46

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