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Please my first theorem which I want it to be Theorem 1.1 happens to be in Chapter 2 and as thus it reads Theorem 2.1 as opposed what I want. I mean Theorem 1.1, please how can I change this? By always defining what I want in the theorem number and sections.

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  • 2
    The (composed) number after “Theorem” is supposed to help readers into finding it. What would be the meaning of the first 1, given that the theorem is in chapter 2?
    – egreg
    Commented May 14, 2023 at 16:15
  • I'm working for someone and he claims since it is the first theorem to appear in the project, it should be tagged Theorem 1.1 despite it appearing on the second chapter.
    – Memristor
    Commented May 14, 2023 at 16:22
  • And what about the following theorems?
    – egreg
    Commented May 14, 2023 at 16:27
  • 2
    @Memristor -- 1.1 doesn't make any sense. Just a single number, 1, would make sense, and then just number equations consecutively through the document. Maybe you could try some logical persuasion. Commented May 14, 2023 at 16:28
  • @egreg. The following theorems can then follow as Theorem 1.2, Theorem 1.3, . . . in that order.
    – Memristor
    Commented May 14, 2023 at 20:15

1 Answer 1

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This is completely illogical, but the customer's always right. 😉

\documentclass{book}
\usepackage{amsthm}

\newcommand{\thechapterminusone}{\the\numexpr\value{chapter}-1\relax}
\newtheorem{theorem}{Theorem}[chapter]
\renewcommand{\thetheorem}{\thechapterminusone.\arabic{theorem}}

\begin{document}

\chapter{First}

\chapter{Second}

\begin{theorem}\label{test}
Some people have weird requirements.
\end{theorem}

\begin{proof}
See the numbering of theorem~\ref{test}.
\end{proof}

\end{document}

enter image description here

Just remove the definition of \thetheorem if logic becomes active again.

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  • Thank you so much, sir. So, how will the Lemma, Examples and the rest will now go?
    – Memristor
    Commented May 15, 2023 at 9:34
  • @Memristor It depends on whether they're numbered autonomously or share the counter with theorems.
    – egreg
    Commented May 15, 2023 at 10:28
  • Thank you so much, sir. The assistant came in handy. I'm grateful.
    – Memristor
    Commented May 15, 2023 at 10:58
  • @Memristor If you are satisfy with the answer, then kindly accept it by clicking the tick mark symbol
    – GowriSaro
    Commented Jun 14, 2023 at 5:15

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