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.
1,669
questions
119
votes
3
answers
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Theorem without numbering
Is it possible to have single theorems without numbering? I would like to be able to switch them off individually with asterisk-* or have a nono-theorem environment.
\newtheorem{theorem}{Theorem}
\...
110
votes
5
answers
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Non italic text in theorems, definitions, examples
What package should I use, or what setting can I make to the font in theorems so that the text wouldn't be italic. I use amsmath, and from default, everything I write in theorem environments becomes ...
102
votes
9
answers
40k
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How do I repeat a theorem number?
Often in my papers I want to mention theorems in the introduction that are introduced in more detail and proved in a later section.
I'd like to include the statement of these theorems twice over, ...
100
votes
3
answers
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Theorem packages: which to use, which conflict?
As far as I know, one can create theorem environments using any of amsthm, ntheorem, thmtools and probably more.
How should I define my theorem environments? Is one package clearly superior? Which ...
88
votes
2
answers
37k
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Recalling a theorem [duplicate]
Suppose I have some theorem in the paper
Section 1
Theorem 1.1. Let ...
And then later in the paper I want to recall the theorem by reprinting it
Section 4
We recall Theorem 1.1:
Theorem 1.1. Let .....
85
votes
2
answers
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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, ...
70
votes
4
answers
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Custom theorem numbering
This one should be easy for the gurus…
Suppose I want to define a theorem environment which has a custom numbering scheme. That is, instead of being numbered according to some counter, it is numbered ...
68
votes
8
answers
52k
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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 ...
65
votes
1
answer
44k
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How to change the word "Proof" in the proof environment?
I want to change the word "Proof" into "Solution". Of course the following works.
\begin{proof}[Solution] \end{proof}
But it's quite cumbersome to add this additional [Solution] every time. Is there ...
59
votes
2
answers
207k
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Solid black box in the proof environment
I am using
\documentclass[12pt]{article}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsthm}
\begin{document}
\begin{proof}
A = B
\end{proof}
\end{document}
and an empty square box ...
57
votes
6
answers
64k
views
Customizing theorem name
Suppose I have a series of theorems that I would like displayed as
Jim's Theorem.
Bob's Theorem.
Will's Theorem.
rather than as “Theorem (Jim).”, “Theorem (Bob).”, and “Theorem (Will)”. ...
53
votes
6
answers
44k
views
Changing style of Proof
I'm using the \begin{proof} of the amsthm package. And I want to change the style of the Proof word that is added in the beginning. By default it is italic, I want to make it bold. How can I do it?
53
votes
7
answers
17k
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Is it possible to skip the first line in a theorem environment?
I'm currently writing up some solutions, and I like to rewrite the problem before answering it.
I've set exercise to be a theorem environment, and the code I'm using is
\begin{exercise}
\begin{...
51
votes
1
answer
19k
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amsthm: what are the newtheoremstyle parameters for the default styles?
The package amsthm contains the predefined theorem styles plain, definition and remark which you can employ using \theoremstyle before your \newtheorem.
You can also create new theorem styles like ...
49
votes
1
answer
37k
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How can I create a "Proof of Theorem x.xx" header for a proof environment?
In many papers in mathematics, the author states a theorem in somewhere and adds some explanations and perhaps some lemmas and later starts the proof with a phrase like "Proof of Theorem x.xx" (x's ...
48
votes
7
answers
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\qed for theorems without proofs
It is common to place a \qed-Box at the end of a theorem statement (or lemma, corollary, ...) if we give no proof for that statement.
How can I do this in LaTeX? If I place a qed-box at the end of ...
46
votes
5
answers
87k
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box around theorem statement
Is there an easy way to put a box around a theorem in LaTeX? For example to state an important theorem.
I tried using page 20 of the ntheorem documentation,
but I do not know how to use the package.
46
votes
4
answers
21k
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Citing inside theorem header
How do I create something like this without getting any errors?
\begin{thm}[\cite[page 10]{ABC2011}]
...
\end{thm}
I tried putting various things into {...} brackets, but not eliminating any errors. ...
45
votes
3
answers
33k
views
Remove the qed symbol from only one proof environment, not all
I have seen several posts on how to remove the qed symbol in a proof, but that affects all proof environments. I would like to know how to remove the qed symbol in a particular proof because I have ...
45
votes
4
answers
33k
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How to make the optional title of a theorem bold with amsthm?
I use the code mentioned in Title of the theorem:
\begin{theorem}[The title]
Some statement
\end{theorem}
However with amsthm the optional title -- above: "The title" -- is neither bold nor italic, ...
45
votes
4
answers
75k
views
A better way to reference theorem-like environments?
I know how to use \label and \ref to get a reference to a result(or whatever else really) that I have made previously in the document. But this is tedious and requires me to create a label name every ...
42
votes
2
answers
62k
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Theorem numbering as chapter.section.subsection.theorem number
This might be a simple question but it's weird that I couldn't find the answer anywhere on the internet.
If I set as
\newtheorem{-}{-}[section]
then I get the numbering as Theorem [section....
42
votes
5
answers
8k
views
How to prevent paragraph breaks after theorem environments?
By default, the list environments (such as itemize) have the nice property that if you add a blank line after it, it starts a new paragraph, and if you don't, the paragraph continues. So
The ...
37
votes
2
answers
36k
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How do I get non-italic words in a theorem environment?
I want some words in my theorem environment to not be italic. I know there are simple ways to get the entire theorem in roman, but I'm looking for an italic theorem with specified words in roman.
I ...
37
votes
4
answers
9k
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 ...
36
votes
1
answer
36k
views
Numbered Definitions, Theorems in beamer
How to get numbered Lemmas, Definitions, Theorems and so on in beamer?
36
votes
3
answers
28k
views
Proofs in Beamer
I'm writing a presentation in Beamer, where I present proofs which are longer than one frame. How to make Beamer to break it automatically to another frame? If it is not possible how am I supposed to ...
35
votes
1
answer
37k
views
Start theorem counter from specific number
I have defined a new theorem and I would like it to start from a specific number(let's say 3). At first I thought of using \addtocounter{\theexe}{3}(where exe is the new theorem) but I get an error ...
34
votes
4
answers
19k
views
Enumerate alignment problem in theorem environment
I'm using amsart. When I create an enumeration inside a theorem environment, the numbering is not aligned properly:
Theorem 14. (1)
(2)
(3)
(4)
How do I shift the (2),(3),... to be aligned with (1)?
...
34
votes
1
answer
105k
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Using \newtheorem
Edited to include complete code, as suggested:
Here is what the preamble of my main file looks like:
\documentclass[12pt]{report}
\usepackage{epsfig}
\usepackage{upmathgrad2}
\usepackage{...
34
votes
3
answers
15k
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How to get correct autoref for theorems
I have some own theorem environments. And my theorems are numbered like the chapter. Now I would like to use autoref with that. But it does not work like it is described here (http://www.tug.org/...
33
votes
4
answers
37k
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Proof environment - line break after the "Proof."
I want to make the proof environment in amsthm package to auto add a line break right after the "Proof."
I tried the following code, which also removed the QED sign, but it doesn't work: No linebreak ...
33
votes
1
answer
58k
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How can one cite theorems of references?
I would like to cite the item (iii) of proposition 3 of a reference. How can I do it? Which ways do you suggest?
This is a question not only about LaTeX, but also about style.
One option I have seen ...
32
votes
3
answers
29k
views
How to change the way theorems are displayed?
I am in the process of writing a large document containing some theorems, lemma, and propositions. Currently, I am using packages amsmath and amsthm. I defined my own environment for theorems by ...
30
votes
1
answer
11k
views
Problem with qedhere
In a paper I'm writing, I end a proof with a displayed equation that has some cases in it. The relevant code looks something like the following:
\[f(x) = \begin{cases}
2x & \text{if $x<0$}\\
...
30
votes
2
answers
7k
views
How do I get sub-numbering for theorems (Theorem 1.A., Theorem 1.B., Theorem 2.)?
I am trying to number my theorems as follows:
Theorem 1.A. First part of a theorem.
Theorem 1.B. Second part of the theorem.
Theorem 2. A theorem with no parts.
The following almost works:
\...
30
votes
1
answer
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Using LaTeX, how can I restate a theorem, with the same theorem number, later in a paper? [duplicate]
Possible Duplicate:
How do I repeat a theorem number?
I am writing a paper, and would like to state the main results in the Introduction. Then, when I come to prove the main results in later ...
28
votes
6
answers
90k
views
Defining my own proof environment?
How would I define a proof environment that is basically used with
\begin{proof}
some proof here
\end{proof}
and it would be equivalent to:
\paragraph{Proof:} some proof here
\hfill \box
?
27
votes
3
answers
3k
views
amsthm with shared counters messes up autoref references
When I define amsthm theorem environments with shared counters,
autoref messes up the names of the references.
For example, in the output below, we should have "Definition 2" instead of "Theorem 2".
\...
26
votes
2
answers
60k
views
Theorem environment - line break after label [duplicate]
Possible Duplicate:
ntheorem environment with indentation
Skipping line after “Proof” in proof environment
\begin{theorem}[label]
The theorem text.
\end{theorem}
I want to have ...
26
votes
1
answer
56k
views
Using amsthm but still getting "Environment theorem undefined"
I'm trying to write up all my university theorems and I cant get the theorem environment to work. Here is a mini example of what I'm trying to do.
\documentclass[a4paper,12pt]{article}
\usepackage[...
26
votes
1
answer
3k
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Cleveref with counters with same name
I am trying to use the cleveref package.
I have the following counters defined (hopefully this is the right way to do it!)
\newtheorem{thm}{Theorem}[section]
\newtheorem{lemma}[thm]{Lemma}
\...
26
votes
1
answer
12k
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How to cross-reference theorems with "Theorem"?
I use
\begin{lemma} \label{aaa} ... \end{lemma}
\begin{theorem} \label{bbb} ... \end{theorem}
and many other similar kinds in the same document.
When I cross-reference those lemmas and theorems ...
25
votes
2
answers
26k
views
How to rename theorem (or lemma) in Beamer to another language?
I'm Malay user. I want to rename the theorem tag in Beamer. Does anyone know how to do it? When the document class is article or book, I can simply modify the preamble as follows:
\newtheorem{theorem}...
25
votes
2
answers
43k
views
Title of the theorem
in my paper the text inside theorem is italic while the word Theorem 1 is bold and not italic. I would like to have a title of the theorem also not italic. The example is here:
Theorem 1. (The title) ...
25
votes
3
answers
12k
views
Is there a \renewtheorem equivalent of \renewcommand, using amsthm and not ntheorem?
Suppose I have a theorem that is defined a certain way, as follows.
\newtheorem*{mytheorem}{Foo}
And I want to redefine it another way further down in my document, as below.
\newtheorem*{mytheorem}{...
25
votes
2
answers
30k
views
Allow theorem split in many frames in beamer
How can a theorem-like environment be (automatically) split into multiple frames if the vertical space it needs is not enough in a frame?
In my document preamble I have
\theoremstyle{definition}
\...
25
votes
1
answer
32k
views
Consecutive number of theorems, propositions, etc
I'm using
\usepackage{amsthm}
\newtheorem{theorem}{Theorem}
\newtheorem{proposition}{Proposition}
The numberings of Theorem and Proposition are not consecutive (I get Theorem 1 followed by ...
24
votes
3
answers
19k
views
How to Make Theorems and Equations Share Numbering
How do I make theorems and equations share numbering? The default numbering system goes like this:
Theorem 1. Blah blah blah...
1=0+1 (1)
Theorem 2. More blahs...
Theorem 3. No more ...
24
votes
2
answers
32k
views
Spacing before and after with \newtheoremstyle
I want to define my own theorem style for examples. I want them to be numbered the same way as theorems (so Example 2.4 follows Theorem 2.3); I want them to be formatted exactly the same as theorems ...