I am using an ACM template, and then I get the error Undefined control sequence for


I think it's caused by \plus and \times because after I removed them it works fine, but I don't know how to solve it.

  • as the error message clearly shows, \plus is not a defined command, use + (this isn;t related to ACM at all you would get the same error in most latex classes. May 3, 2021 at 17:59

1 Answer 1


The error message on the supplied document is

! Undefined control sequence.
l.3 $(N[X],\plus
? h
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.


clearly showing that \plus is not defined. Use + to get a plus sign. (You would get the same error in the standard classes, not just ACM)

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