{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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Indentation for proofs

I'm using amsbook document class and amsthm package. I want the proofs to stand out from the rest of the text by slightly indenting them, i.e. leaving some margins from left and right. How do I do ...
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Space before proof

I am trying to make LaTeX put no additional space between theorem and proof. Here is my code: \newtheorem*{pr3}{Theorem} \begin{pr3} foo \end{pr3} ...
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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 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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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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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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Customizing list of theorems (LaTeX)

Is it possible to avoid brackets surrounding the name of a theorem in the \listoftheorems from thmtools? And if so, how do I do that?
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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 ...