# Questions tagged [theorems]

{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.

1,243 questions
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### Corners for theorems and definitions [duplicate]

I was wondering if there is any package or a simple snippet I could use to get the kind of corners shown in the picture for theorems and definitions. Thanks in advance.
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### Why isn't \def working?

I just learned about the "amsthm" package and I am trying to learn how to use it. As I understand it this package already has some predefined environments such as "def", but I can make new ...
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### How can I write this in LaTeX like image?

I'm new to LaTeX. This photo is part of my assignment, but I couldn't. How can I write like image(It has to be the same)?
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### Question regarding a special “keyword”

I wold like to know how do I get that "preposition" in bold. Is there a special command? I've seen it written like "definition" also. Thanks in advance!
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### Normal text in Theorem?

How do I write normal text just for a small portion in the Theorem environment? Ive tried \text{} and nothing. Any suggestions?
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### How to create sub-assumptions within an assumption chunk and be able to reference them via labels?

I currently am trying to create an Assumption with 4 parts to it. I have first declared the assumptions chunk, then enumerated A,B,C, and D within. I am then trying to create reference labels for them....
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### Vertical space in theorem environment closed by an equation containing fractions

With the amsart document class, if a theorem ends with an equation containing fractions, then the vertical spacing between the theorem and the next line seems too small. Here is a working example: \...
36 views

### Label and sublabel for theorem

In my text file, I am using a theorem environment (from the amsthm package), that contains two parts (for two different cases). The theorem is often referenced as a whole, so I need a global label, ...
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### Create a claim environment for nested claims inside theorem proofs using thmtools

Consider the following declarations: \usepackage{amsmath, amsthm, amssymb, thmtools} \declaretheorem[numberwithin = section]{theorem} \declaretheorem[sibling = theorem, style = definition]{...
10k views

### Beamer newtheorem translation

Consider the following MWE: \documentclass{beamer} \usepackage{lmodern} \usepackage[T1]{fontenc} \usepackage[utf8]{inputenc} \usepackage[spanish]{babel} \uselanguage{Spanish} \languagepath{Spanish} ...
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### Reproduce the vertical margins below the environment

In short, I would like to reproduce the vertical margins below the definitions and double bar below the remarks as shown in the following picture: I've already browsed the posts without any solution. ...
27 views

### Change numbering in MD Framed

I want to change the numbering using mdframed. The code is: \mdfdefinestyle{theoremstyle}{% linecolor=black, linewidth=1pt, frametitlerule=true, frametitlefont=\sffamily\bfseries, ...
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### How can I write a “definition” like this?

The theorem of the picture is written in bold, I mean: Theorem 1.2 (Pythagorean theorem). I want to write a definition with that format. Also, it would be better if it's written with small capitals. ...
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### How to get \ref to write “Theorem 5” or “Lemma 5” Instead of just “5”?

I sometimes change something from "\begin{theorem}" to "\begin{lemma}" (I have my own commands: \newtheorem{theorem}{Theorem} and \newtheorem{lemma}{Lemma}). But if I just write \ref{theorem1}, then ...
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### Referencing labels created for theorems inside a subtheorem environment links to the theorem before

I am currently trying to create subtheorems that are linkable. I referenced the code put forth by another post, here: How do I get sub-numbering for theorems (Theorem 1.A., Theorem 1.B., Theorem 2.)? ...
22k views

### Pushing \qed to the right within a displayed formula

In my own custom theorem environment, I'm using the \qed command to create a white box. This works wonderfully when the theorem ends with a regular paragraph -- the box is pushed to the right where it ...
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### Indenting all lines in a theorem environment

I have made the following theorem environment \documentclass{article} \usepackage{amsmath} \usepackage{amsthm} \newtheoremstyle{proposition} {.5\baselineskip} {.5\baselineskip} {} ...
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### How to define an environment for a boxed and named theorem?

The environment below gives a boxed theorem with normal font (non italic text). \documentclass[11pt]{article} \usepackage[tikz]{mdframed} \usepackage{amsthm} \newtheorem{thm}{Theorem}[section] \...
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### theorem word in italic not in bold

I want use theorem of LaTeX but I don't want the word "theorem" in bold. After I want like image in italic but not in bold. How set this? I only want change for observation and don't want change all "...
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### Ultimate proof at the end/in appendix: different sections, with references to proof/theorem, restate, and synctex

I saw lot's of different posts/answers to put the proof at the end, but none of them fully convince me. Indeed, I'd like to have the following: a way to put the proofs in different sections: some ...
96 views

### Define double environments

TLDR; How can I define a "double" environment like in theorems/proofs (with an optional proof)? I'm defining a small library that is supposed to behave more or less like theorems/proof environments (...
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### Change the font size of the word “Theorem”

What should I do if I want to change the font size of the word "Theorem" but not of the body of the theorem? It doesn't seem that \newtheoremstyle has a parameter for this. It is probably a rather ...
3k views

### How do I show the labels of theorems, definitions, etc

I'm using the package showlabels which has the effect that when I label something with \label{thing1} the thing1 gets typeset in the margin of my document next to where I put the label. This works ...
2k views

### Counter for tcolorbox

I would like to create a boxes for theorem definition proposition to looks like the following image ( but with counter for each box ) : I tired with tcolorbox Here's my code: %this is created ...
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### No vertical spacing between Theorems in Beamer

How to set no vertical spacing between Theorems in Beamer? Since the following code produce some vertical spacing above and below each theorem. \documentclass{beamer} \usetheme{Berlin} \begin{...
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### How can I reference item (i) in Theorem 1.1 such that it displays “Theorem 1.1-(i)”?

Consider the following example: \documentclass{article} \usepackage[utf8]{inputenc} \usepackage{amsmath, amsthm, amssymb, mathtools, thmtools} \usepackage{hyperref, cleveref} \usepackage[shortlabels]...
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### Using restatable with a custom environment

I want to use the restatable package with a custom environment. It almost works except when I restate with \name* it does not use the original label. Before you ask, I'm not using newtheorem because ...
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### Typesetting lemmas in latex with shadethm package

I am trying to get the shadethm package to typeset lemmas in shaded boxes, but am failing so far. The following document produces \documentclass[11pt]{article} \usepackage[utf8]{inputenc} \...
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### Hanging indent in an amsthm theoremstyle [duplicate]

I'm aiming to have a theoremstyle which has hanging indentation, where all lines after the first line are indented by some amount of space. I've searched for previous answers to similar questions, but ...
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### Recall an hypothesis

I actually started to use Latex in order to prepare better works. After that, there is a problem. This is my code actually: Determine Hyp 1 and 2 \newtheorem{hypothesis}{Hypothesis} \begin{...
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### Extend theorem header with title by citation

How can I redefine the theorem style, so that I can provide two "optional" arguments (I'm fine with using \begin{Definition}[title]{} if no citation is wanted.) I guess I'm quite flexible with the ...
38 views

### How to automatically label using theorem counter?

Someone please help me! I have some custom environments and I want to label them according to theorem counter. Means, that I get a numbering like Def. 1.1, Thm. 1.2 and so on. Right now, I have to ...
5k views

### How to place all proofs automatically in appendix?

Can I place all proofs to theorems in appendix automatically? Usually proofs are written in the LaTeX codes immediately after the theorems. Without physically moving proofs to appendix, how can I ...
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### Problem with expand, all restatable theorems points to the same theorem

I'm trying to manually do a small script that let me put proofs at the end, restate theorem... But I'm having some troubles with the restate, because all the theorems have the same name, so when I ...
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### How to cite a theorem when its order (and thus number) keeps changing

The \begin{theorem} command will automatically order theorems as they appear in the file. I am currently writing a paper and as I edit the paper the order of the theorems keep changing. However, I ...
43 views

### How to remove the unexpected vertical space in the theorem environment?

When I use \pause in  formula in the theorem environment, I get an unexpected extra space below the formula; see Theorem: Pause (formula). Now I remove it using \vspace{-0.60}cm, as in Theorem: ...
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### Underline Theorem's 'Theorem' part, not the title

I would like to have two different styles of theorems in my LaTeX document to differentiate between original and unoriginal work. For one I would like the 'Theorem' underlined and the other I would ...
99 views

### problem with theorem, tikzpicture and center environment

I use a dialog-bubble style for some theorems, by using the code below, that works fine. \documentclass[a4paper,11pt,twoside]{book} \usepackage[a4paper,left=2.5cm,right=2.5cm,top=2.5cm,bottom=2.5cm]{...
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### How to insert theorems to tcolorbox?

I trying to insert a theorem to tcolorbox without title. Here is MWE (with LyX): % Preview source code %% LyX 2.3.2-2 created this file. For more info, see http://www.lyx.org/. %% Do not edit ...
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### Correctly order float counter (perpage.sty) while sharing eqn/thm counter

Sharing float (fig) and thm counter can be done with \newtheorem{theorem}[figure]{Theorem}. Correctly ordering float (fig) counter based on actual location in the PDF (as opposed to location in ...
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### Reference Subpoints of Lemma

I have Lemmata consisting of several subpoints (basically a collection of similar formulas) and I want to reference these subpoints in text by "Lemma 1 (1)". So far my code looks like this: \...
230k views

### Theorem/Definition/Lemma problem — Numbering

I am trying to work on the numbering of the theorems/definitions/lemmas etc., and I have some problems with the numbering. I would like the theorems, propositions, corollarys, definitions, ...
237 views

### Section with answers created automatically

My question is quite similar to this one, but I think a slightly different approach is needed. I have a document with a lot of exercices and I'd like to add aswers and hints to them in a certain ...
65 views

### How to redefine proof?

I want to define a new proof environment. I have defined it as below. \documentclass{article} \usepackage[section]{placeins} \usepackage[utf8]{inputenc} \usepackage[english]{babel} \usepackage{...
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### Change reference behaviour of newlist depending on theorem environment

I am using ntheorem and cleveref, and I want to reference enumerate environments inside theorems, like the following: \documentclass{article} \usepackage{ntheorem, cleveref, enumitem} % Define ...
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### Automatic theorem list

In the accepted answer to Code between \begin{environment} and \end{environment} stored in an array it's shown how to create an automatic list of theorems using expl3 syntax. However the \...
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### Print all theorems

\documentclass[french]{book} \usepackage[french]{babel} \usepackage{amsmath} \usepackage{amssymb} \usepackage{amsthm} \begin{document} { \newtheorem{theorem}{Théorème} \newtheorem*{theorem*}{...
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### How to choose if theorem numerote

I'm currently working on a layout that is divided in article and alinea. Basically I've two functions. In each functions there is an environment dedicated to show the texts in a certain layout. ...