I used to type many documents with amsmath package. Now I need to prepare a document with the iopart class. This class is incompatible with amsmath. How should I type then the \tfrac command? Somehow I could not find an answer here or on the Internet.

  • {\textstyle\frac{a}{b}} Commented Sep 20, 2023 at 20:43
  • @DavidCarlisle Thank you very much, don't know what I was thinking.
    – yarchik
    Commented Sep 20, 2023 at 21:17
  • See my code (the second block) in tex.stackexchange.com/a/560844/4427 that shows how to use amsmath with iopart. I believe they won't notice.
    – egreg
    Commented Sep 20, 2023 at 22:04
  • @egreg Thank you! I am surprised by no reaction response of the iopart support following your email.
    – yarchik
    Commented Sep 21, 2023 at 7:23
  • @yarchik Well, I just tried downloading iopart.cls from the IOP site and it's still at version 0.0 1996/06/10.
    – egreg
    Commented Sep 21, 2023 at 8:22

1 Answer 1


You can define \tfrac as {\textstyle\frac{a}{b}} if amsmath is not usable.

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