I have two definitions defined as follows:

\newtheorem{definition_1}{Definition 1}[chapter]
    Definition 1 text here.

\newtheorem{definition_2}{Definition 2}[chapter]
    Definition 2 text here.

With references to them as


Both give me the same definition number (3.1). I have enabled the associated package:


How do I fix this?

1 Answer 1


You needn't define a new environment at each use:



Text of the definition

Text of the second definition

\ref{defa} and \ref{defb}

All theorem-like environment are declared before \begin{document}.

  • How to make this compatible with \Cref ? Sep 28, 2018 at 15:05
  • @Sari Isn't it out of the box?
    – egreg
    Sep 28, 2018 at 15:13
  • No, it shows ??? NUMBER. Sep 28, 2018 at 15:18
  • 1
    @Sari I added \usepackage{cleveref} after \usepackage{amsthm} and changed \ref into \Cref. This picture (click) shows the expected output.
    – egreg
    Sep 28, 2018 at 15:36
  • Great, my cleverref was before amsthm. It worked, thank :) Sep 28, 2018 at 15:44

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