reference in theorem environment












0















I am using theorem environment and want to put reference near the lemma, however, instead of [18] I am getting (18), how I can fix it?



documentclass{article}
usepackage{amsthm}% http://ctan.org/pkg/amsthm
usepackage{etoolbox}% http://ctan.org/pkg/etoolbox
newtheorem{lemma}{Lemma}%
AtEndEnvironment{theorem}{nullhfillqedsymbol}%
begin{document}
begin{lemma}[18]
This is an important theorem.
end{lemma}
end{document}









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    I am using theorem environment and want to put reference near the lemma, however, instead of [18] I am getting (18), how I can fix it?



    documentclass{article}
    usepackage{amsthm}% http://ctan.org/pkg/amsthm
    usepackage{etoolbox}% http://ctan.org/pkg/etoolbox
    newtheorem{lemma}{Lemma}%
    AtEndEnvironment{theorem}{nullhfillqedsymbol}%
    begin{document}
    begin{lemma}[18]
    This is an important theorem.
    end{lemma}
    end{document}









    share|improve this question







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    user181313 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
    Check out our Code of Conduct.























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      I am using theorem environment and want to put reference near the lemma, however, instead of [18] I am getting (18), how I can fix it?



      documentclass{article}
      usepackage{amsthm}% http://ctan.org/pkg/amsthm
      usepackage{etoolbox}% http://ctan.org/pkg/etoolbox
      newtheorem{lemma}{Lemma}%
      AtEndEnvironment{theorem}{nullhfillqedsymbol}%
      begin{document}
      begin{lemma}[18]
      This is an important theorem.
      end{lemma}
      end{document}









      share|improve this question







      New contributor




      user181313 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.












      I am using theorem environment and want to put reference near the lemma, however, instead of [18] I am getting (18), how I can fix it?



      documentclass{article}
      usepackage{amsthm}% http://ctan.org/pkg/amsthm
      usepackage{etoolbox}% http://ctan.org/pkg/etoolbox
      newtheorem{lemma}{Lemma}%
      AtEndEnvironment{theorem}{nullhfillqedsymbol}%
      begin{document}
      begin{lemma}[18]
      This is an important theorem.
      end{lemma}
      end{document}






      cross-referencing theorems






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      asked 15 mins ago









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