thmtools: Parentheses behaving weirdly in note

Question

I used thmtools package to define theorem style because I wanted just the note to have a different colour:

\documentclass{article}
\usepackage{xcolor} 
\usepackage{amsthm}
\usepackage{thmtools}
\declaretheoremstyle[
spaceabove = \topsep,
spacebelow = \topsep,
headfont = \normalfont\bfseries,
notefont = \color{olive}\normalfont\mdseries,
notebraces = {}{},
headformat = \NAME{} {\NUMBER}\NOTE,
headpunct = {\newline},
bodyfont = \normalfont\upshape
]{fordefinition}
\theoremstyle{fordefinition}
\newtheorem{defn}{Definition}[section]
\begin{document}
\begin{defn}[Property(T) group]
asdg
\end{defn}
\end{document}

But parentheses () behave weirdly within the note. The right parenthesis always appears at the end of the note.

Any idea how to fix this so that I get the parenthesis where I want it to? I tried using \right) but it didn't work and I don't think it is a good idea.

P.S. Have I also defined the newline properly to give a line break after the heading? It works, but I am unsure whether this is the ideal way to do it.

Welcome to TeX.SX! Could you please expand your code to form a complete minimal working example (MWE)? — epR8GaYuh, May 30 '23 at 18:11

score 3 · Accepted Answer · answered May 30 '23 at 19:02

That's strange, indeed. I tried a few things, well known candidates for trouble, amongst which:

putting a % at line ends is needed in macros, but irrelevant here
treating the parantheses as a unit (so to say) was vital: {(T)}

Looks like otherwise you confuse this package when its internals "eat and digest" the data (as Knuth put it for TeX) :

...
processing t is fine
processing y is fine
processing is fine
processing ( puts you on the wrong route

That's it.

% https://tex.stackexchange.com/questions/687217/thmtools-parentheses-behaving-weirdly-in-note
\documentclass{article}
\usepackage{xcolor} 
\usepackage{amsthm}
\usepackage{thmtools}
\declaretheoremstyle[%
spaceabove = \topsep,%
spacebelow = \topsep,%
headfont = \normalfont\bfseries,%
notefont = \color{olive}\normalfont\mdseries,%
notebraces = {}{},%
headformat = \NAME{} {\NUMBER}\NOTE,%
headpunct = {\newline},%
bodyfont = \normalfont\upshape%
]{fordefinition}
\theoremstyle{fordefinition}
\newtheorem{defn}{Definition}[section]
\begin{document}
 \begin{defn}[Property {(T)} group]% <<<
    Some of the most wonderful theorems ever heard of.
 \end{defn}
\end{document}

This is indeed the solution. The source of the problem is with the internal macro \thmt@embrace, which is defined as \def\thmt@embrace#1#2(#3){#1#3#2}. — Udi Fogiel, May 30 '23 at 19:14

score 1 · Answer 2 · answered Jun 02 '23 at 15:54

The thmtools package uses () in order to delimit the note in some of its macros (it shouldn't) and this fails if there are parentheses in the notes.

Here I patch the relevant commands to use <> instead.

\documentclass{article}
\usepackage{xcolor} 
\usepackage{amsthm}
\usepackage{thmtools}
\usepackage{xpatch}
\makeatletter
\xpatchcmd{\thmt@setheadstyle}{(}{<}{}{}
\xpatchcmd{\thmt@setheadstyle}{)}{>}{}{}
\def\thmt@embrace#1#2<#3>{#1#3#2}
\makeatother
\declaretheoremstyle[
  spaceabove = \topsep,
  spacebelow = \topsep,
  headfont = \normalfont\bfseries,
  notefont = \color{olive}\normalfont\mdseries,
  notebraces = {}{},
  headformat = \NAME\ \NUMBER\NOTE,
  headpunct = {\newline},
  bodyfont = \normalfont\upshape
]{fordefinition}
\theoremstyle{fordefinition}
\newtheorem{defn}{Definition}[section]
\begin{document}
\begin{defn}[Property(T) group]
asdg
\end{defn}
\end{document}

thmtools: Parentheses behaving weirdly in note

2 Answers2