I'm writing my thesis using the amsbook class. I would like to number theorems by

[Chapter.Section.counter of the Theorem].

If I use


it gives only [Chapter.counter of the Theorem]. If I use

\newtheorem{theorem}{Theorem}[chapter] \numberwithin{theorem}{section}

it gives only [Section. counter of the theorem]

How can I do? Thank you in advance.

  • 2
    Why don't you use \newtheorem{theorem}{Theorem}[section]? – Bernard Apr 4 '18 at 16:34
  • This gives only [section.counter of theorem]. I would like also to count the chapter – Capublanca Apr 4 '18 at 19:40
  • 1
    Try \renewcommand{\thetheorem}{\thechapter.\thesection.\arabic{theorem}. – Bernard Apr 4 '18 at 22:03
  • @Bernard -- that should be the answer. please add it. – barbara beeton Jun 10 '18 at 21:21

This answer really belongs to @Bernard.

The chapter number can be added to the output theorem counter without forcing the chapter number to appear as part of the section number by this redefinition:

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