{theorems} are environments which are commonly numbered. They are extensively used in math texts. Examples of such environments are theorems, corollaries, lemmas, propositions, remarks and definitions. Popular packages are {amsthm}, {ntheorem}, and {thmtools}. Covers discussion on proofs too.

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Automatically add theorems to index and label them

In another question (Remove math from command parameter to get only the letters) this command was elaborated to have an optional argument for sorting purposes within the index \documentclass{article} ...
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How to identify the counter of Equation, Theorem, and Section

I asked before how to identify the counter of Equation and Theorem. A simple answer suggested there is \newtheorem{thm}[equation]{Theorem} A simple variation allows me to identify the Theorem and ...
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theoremprework Error with ntheorem

I have defined \theoremheaderfont{\normalfont\bfseries} \theoremprework{\bigskip\hrule} \theorempostwork{\hrule\bigskip} \theorembodyfont{\slshape} \newtheorem{definition}[satz]{Definition} and now ...
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How to define different colors for different theorem-like environments in beamer

After reading section 12.4 Theorem Environments from beameruserguide I understand that all theorem like environments (theorem, lemma, corollary, ...) except example use same beamertemplate which means ...
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Custom theorem numbering … and extend to lemma etc [closed]

In Custom theorem numbering @egreg provided a way to custome theorem numbering: \documentclass{article} %\usepackage{amsthm} %% uncomment to see the difference \newtheorem{innercustomthm}{Theorem} ...
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Faint text after new theorem [closed]

This code using \newtheorem produces faint text afterwards. What's the remedy? \documentclass[xcolor=dvipsnames]{beamer} \usetheme[height=9mm]{Rochester} \setbeamertemplate{items}[ball] ...
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nopagebreak between rule and custom theorem env

I'm making a custom theorem environment. Here's a minimal example of my problem, with some filler text borrowed from the GPL: \documentclass{scrbook} \usepackage[dvipsnames]{xcolor} ...
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How to ignore proofs? [duplicate]

I'd like to print a shorter version of my paper without all the proofs, I'm thinking about something like \renewenvironment{proof}{\begin{comment}}{\end{comment}} but that activates the comment ...
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Theorem-like environments in Latexit?

I want to use Theorem-like environments in Latexit. How can I do this?
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\theoremindent adds space to left side when used with RTL languages

Trying to use ntheorem's \theoremindent seems to indent the left side rather than the right side when used with polyglossia and right-to-left languages: \documentclass{article} \usepackage{ntheorem} ...
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thmtools with thmbox split in two pages

I am trying to use the thmbox=Moption from the thmtools package. But sometimes in the text when there isn't enough space for the theorem to fit in the bottom of the first page, it moves it to the next ...