keytheorems

A LaTeX package to use amsthm with a key-value interface. Provides most of the functionality of thmtools (and a bit more!) but written in expl3. If you find a bug please open an issue or pull request.

The package is maintained by Matthew Bertucci.

Sample document

\documentclass{article}
\usepackage{amssymb,amsmath}
\usepackage{keytheorems}
\usepackage{hyperref}

\newkeytheoremstyle{mystyle}{
    % <insert options>
    }
\newkeytheorem{theorem}[
    style=mystyle,
    parent=section
    ]
\newkeytheorem{remark}[
    style=remark,
    numbered=no
    ]

\begin{document}

\section{Some theorems}

\begin{theorem}[
    note=Strong Bertini over $\mathbb{C}$,
    label=strongbertini
    ]
Let $X$ be a smooth complex variety and let $\mathfrak{D}$ be a positive
dimensional linear system on $X$. Then the general element of $\mathfrak{D}$ is
smooth away from the base locus $B_{\mathfrak{D}}$. That is, the set
    \[\{H\in\mathfrak{D}\mid D_H \text{ is smooth away from } B_{\mathfrak{D}}\}\]
is a Zariski dense open subset of $\mathfrak{D}$.
\end{theorem}

\begin{remark}
In fact, \autoref{strongbertini} holds over any algebraically closed field of
characteristic zero.
\end{remark}

\begin{theorem}[Bertini over any field]
Let $X\subset\mathbb{P}_k^n$ be a smooth projective variety over a field $k$.
Then the set of hyperplanes $H\subseteq\mathbb{P}_k^n$ such that $X\cap H$ is
smooth is a Zariski dense open subset of $(\mathbb{P}_k^n)^*$.
\end{theorem}

\listofkeytheorems

%%% compare with
%\listofkeytheorems[ignoreall,show=theorem]
%\listofkeytheorems[swapnumber]
%\listofkeytheorems[title=BLUB]
%\listofkeytheorems[print-body] % needs 'store-all' package option

\end{document}

Documentation

There is a list of commands and keys offered by the package here. More of a reference document than documentation.

Differences with thmtools

Some of the code is a direct translation from thmtools but a few things are changed:

• The only backend supported is amsthm, and it is loaded by the package. As I understand it, ntheorem has quite a few bugs and no active development, and if you're just using the kernel \newtheorem then you don't need a package like this.
• Theorem hooks use the kernel hooks. Thus unlike the prefoot and postfoot hooks of thmtools, all code chunks are added to hooks in the order declared (unless given a distinct label; then the chunks are reversed). The order of generic/specific hooks remains the same. Furthermore, the command for adding to theorem hooks is \addtotheoremhook{<hook name>}{<theorem name>}.
• thmtools changes some style settings to be default that are different from amsthm defaults, but only if a custom style is called. Example:

\declaretheoremstyle[spaceabove=20pt]{mythmsty}
\declaretheorem[style=mythmsty]{mythm}

• is different from just

\declaretheorem{mythm}

• as in the former, bodyfont is \normalfont, not the default \itshape. This package keeps the defaults unless a key is specifically given.
• There is no restatable(*) environment except with package option thmtools-compat. Use the store (alias restate) key. For counters and labels pointing to the restated theorem, use store* (alias restate*).
• Rather than restate=foo defining a command \foo*, theorems are retrieved with \getkeytheorem{foo}. For just the theorem body, use \getkeytheorem[body]{foo}. Also, this retrieval can happen even before the theorem is stated since keytheorems writes the contents to a file.
• The shaded and thmbox keys are only available with the package option thmtools-compat, and they are emulated with tcolorbox. Instead there's an interface to tcolorbox with the tcolorbox={<options>} and tcolorbox-no-titlebar={<options>} key. The mdframed key is not implemented.
• You can reuse styles with the inherit-style key.
• With thmtools, the command \newtheorem{<envname>}{<heading>} is changed to behave like \declaretheorem[name=<heading>]{<envname>}. This is not the default here. Instead either only use the new interface or load the package with option overload.
• Adds several new keys (see doc for details).

thmtools issues resolved by keytheorems

Issues from the thmtools github page, with corresponding keytheorems code that shows the issue resolved.

listoftheorems: filter out restated ones #7

keytheorems does not list restated theorems in the \listofkeytheorems.

\documentclass{article}
\usepackage{keytheorems}

\newkeytheorem{theorem}

\begin{document}

\begin{theorem}[store=foo]
text
\end{theorem}

\getkeytheorem{foo}

\listofkeytheorems

\end{document}

listoftheorems: hide title #8

keytheorems provides the no-title key.

\documentclass{article}
\usepackage{keytheorems}

\newkeytheorem{axiom}
\newkeytheorem{theorem}

\begin{document}

\listofkeytheorems[ignoreall,show=axiom]
\listofkeytheorems[ignoreall,show=theorem,no-title]
     
\begin{axiom}
some axiom
\end{axiom}

\begin{theorem}
some theorem
\end{theorem}

\begin{axiom}
another axiom
\end{axiom}

\begin{theorem}
another theorem
\end{theorem}

\end{document}

Case in point: the tcolorbox key #9

keytheorems provides the tcolorbox and tcolorbox-no-titlebar keys.

\documentclass{article}
\usepackage{keytheorems}

\newkeytheorem{theorem}[
  tcolorbox={
    colback=blue!10,
    colframe=blue!75
    }
  ]
\newkeytheorem{corollary}[
  tcolorbox-no-titlebar={colback=red!10}
  ]

\begin{document}

\begin{theorem}
some theorem
\end{theorem}

\begin{corollary}
some corollary
\end{corollary}

\end{document}

thm-listof: document thmtformatoptarg, new list option? #14

keytheorems provides the note-code key for \listofkeytheorems and \keytheoremlistset.

\documentclass{article}
\usepackage{keytheorems}

\newkeytheorem{theorem}

\begin{document}

\begin{theorem}[my heading]
some theorem
\end{theorem}

\listofkeytheorems[note-code={ [\textit{#1}]}]

\end{document}

Style inheritance in thmtools #15

keytheorems provides the inherit-style key.

\documentclass{article}
\usepackage{keytheorems}

\newkeytheoremstyle{mysty1}{notefont=\itshape}
\newkeytheoremstyle{mysty2}{inherit-style=mysty1,bodyfont=\normalfont}
\newkeytheorem{theorem}[style=mysty1]
\newkeytheorem{corollary}[style=mysty2]

\begin{document}

\begin{theorem}[my heading]
some theorem
\end{theorem}

\begin{corollary}[my heading]
some corollary
\end{corollary}

\end{document}

Restate without theorem headings (head + note) #19

Use \getkeytheorem[body]{foo}.

\documentclass{article}
\usepackage{keytheorems}

\newkeytheorem{theorem}

\begin{document}

\begin{theorem}[store=hello]
Hello!
\end{theorem}

\getkeytheorem{hello}

\section{\getkeytheorem[body]{hello}}

\end{document}

Option clash: numbered=no and thmbox #25

Fixed with keytheorem's implementation of the thmbox key with thmtools-compat.

\documentclass{article}
\usepackage[thmtools-compat]{keytheorems}

\declaretheorem[numbered=no, name=TheoremA,         ]{mytheo1}
\declaretheorem[             name=TheoremB, thmbox=M]{mytheo2}
\declaretheorem[numbered=no, name=TheoremC, thmbox=M]{mytheo3}

\begin{document}

\begin{mytheo1}
    test1
\end{mytheo1}

\begin{mytheo2}
    test2
\end{mytheo2}

\begin{mytheo3}
    test3
\end{mytheo3}

\end{document}

Skip the title of the theorem but leave the . #30

Fixed in keytheorems.

\documentclass{article}
\usepackage{keytheorems}

\newkeytheorem{Teorema}[name=Theorem]

\begin{document}

\begin{Teorema}
  body
\end{Teorema}

\begin{Teorema}[]
  body
\end{Teorema}

\begin{Teorema}[title]
  body
\end{Teorema}

\end{document}

too much space with restatable #40

Fixed in keytheorems.

\documentclass{article}
\usepackage{keytheorems}
\usepackage{kantlipsum}

\newkeytheorem{theorem}

\begin{document}

\begin{theorem}
\kant[2][1]
\end{theorem}

\begin{theorem}[store=foo]
\kant[1][2]
\end{theorem}

\begin{theorem}
\kant[2][1]
\end{theorem}

\getkeytheorem{foo}

\end{document}

restate key with no name leads to (,) in restated title #41

Fixed in keytheorems.

\documentclass{article}
\usepackage{keytheorems}
\usepackage{kantlipsum}

\newkeytheorem{theorem}

\begin{document}

\begin{theorem}[restate=foo]
\kant[1][2]
\end{theorem}

\getkeytheorem{foo}

\begin{theorem}[restate=foobar,name=Heading]
\kant[2][1]
\end{theorem}

\getkeytheorem{foobar}

\end{document}

Help Wanted Print all Theorems? #43

Use the store-all load-time option with \listofkeytheorems[print-body].

\documentclass{article}
\usepackage[store-all]{keytheorems}

\newkeytheorem{theorem}
\newkeytheorem{lemma}

\begin{document}

\begin{theorem}
some theorem
\end{theorem}

\begin{lemma}
some lemma
\end{lemma}

\listofkeytheorems[print-body]

\end{document}

qed option without value fails in declaretheoremstyle #47

Fixed in keytheorems.

\documentclass{article}
\usepackage{keytheorems}

\newkeytheoremstyle{mythmsty}{qed}
\newkeytheorem{theorem}[style=mythmsty]

\begin{document}

\begin{theorem}
Text
\end{theorem}

\end{document}

prefoot and postfoot hooks called twice with restate key #54

Fixed in keytheorems.

\documentclass{article}
\usepackage{keytheorems}

\newkeytheorem{theorem}

\addtotheoremhook{prehead}{PREHEAD}
\addtotheoremhook{posthead}{POSTHEAD}
\addtotheoremhook{prefoot}{PREFOOT}
\addtotheoremhook{postfoot}{POSTFOOT}

\begin{document}

\begin{theorem}
body text
\end{theorem}

\begin{theorem}[store=foo]
body text
\end{theorem}

\end{document}

beamer theorem syntax not fully supported #57

Fixed in keytheorems.

\documentclass{beamer}
\setbeamertemplate{theorems}[numbered]
\usepackage{keytheorems}

\newkeytheorem{MyTheorem}

\begin{document}

\begin{frame}
\begin{MyTheorem}[name=bla]
first text
\end{MyTheorem}
\begin{MyTheorem}<2->[name=bla]
second text
\end{MyTheorem}
\begin{MyTheorem}[name=bla]<3->
third text
\end{MyTheorem}
\end{frame}

% Compare:

\begin{frame}
\begin{theorem}[bla]
first text
\end{theorem}
\begin{theorem}<2->[bla]
second text
\end{theorem}
\begin{theorem}[bla]<3->
third text
\end{theorem}
\end{frame}

\end{document}

restate key incompatible with beamer #58

\documentclass{beamer}
\setbeamertemplate{theorems}[numbered]
\usepackage{keytheorems}

\newkeytheorem{MyTheorem}

\begin{document}

\begin{frame}
\begin{MyTheorem}[restate=foo]
text
\end{MyTheorem}

\getkeytheorem{foo}
\end{frame}

\end{document}

Notes/issues on thmtools, not on Github

continues with unless unique and restate

Should this be numbered or not?

\documentclass{article}
\usepackage{amsthm,thmtools}

\declaretheorem[numbered=unless unique]{theorem}

\begin{document}

\begin{theorem}[label=foo]
bla
\end{theorem}

\begin{theorem}[continues=foo]
bla
\end{theorem}

\end{document}

It does the correct thing when a parent counter is given and is split across that counter.

\documentclass{article}
\usepackage{amsthm,thmtools}

\declaretheorem[numbered=unless unique,parent=section]{theorem}

\begin{document}

\begin{theorem}[label=foo]
bla
\end{theorem}

\section{bla}

\begin{theorem}[continues=foo]
bla
\end{theorem}

\end{document}

Also adds a number if restated, which seems wrong.

\documentclass{article}
\usepackage{amsthm,thmtools}

\declaretheorem[numbered=unless unique]{theorem}

\begin{document}

\begin{restatable}{theorem}{foo}
bla
\end{restatable}

\foo*

\end{document}

qed in both \declaretheoremstyle and \declaretheorem

One would expect the one in \declaretheorem to overwrite, but because the code just adds to the hooks without checking, it's additive.

\documentclass{article}
\usepackage{amsthm,thmtools}

\declaretheoremstyle[qed=$\clubsuit$]{mysty}
\declaretheorem[style=mysty,qed]{theorem}

\begin{document}

\begin{theorem}
bla
\end{theorem}

\end{document}

restate incompatible with thmbox

\documentclass{article}
\usepackage{amsthm,thmtools}

\declaretheorem[thmbox]{theorem}

\begin{document}

\begin{theorem}[restate=foo]
bla
\end{theorem}

\foo*

\end{document}

adding to listoftheorems doesn't work as expected

\documentclass{article}
\usepackage{amsthm,thmtools}

\declaretheorem{theorem}

\begin{document}

\begin{theorem}
bla
\end{theorem}

\addcontentsline{loe}{section}{some text}

\begin{theorem}
bla
\end{theorem}

\listoftheorems

\end{document}

new theorem styles do not preserve "plain" keys

With keytheorems, this is handled only for the AMS classes and acmart.

\documentclass{amsbook}
\usepackage{thmtools}

\declaretheoremstyle[bodyfont=\upshape]{upsty}
\declaretheorem{theorem}
\declaretheorem[style=upsty]{lemma}

\begin{document}

\begin{theorem}
blub
\end{theorem}

\begin{lemma}
blub
\end{lemma}

\end{document}

Things to do

• Clean up the code. Things are out of order, poorly named, etc.
• For a complete list, see keytheorems-ideas.md

License

Released under the LaTeX Project Public License v1.3c or later. See https://www.latex-project.org/lppl.txt.