# latex proof box at end of line with code examples

As a LaTeX user, it's important to know how to properly format your documents to ensure that they are easily readable and visually appealing. One common formatting feature that is frequently used is a proof box at the end of a line. A proof box is a small square that signals the end of a mathematical proof or example. This article will provide an overview of what proof boxes are, how they can be used, and some code examples to help you integrate them into your own LaTeX documents.

What is a Proof Box?

A proof box is a small, square box that is used to denote the end of a proof or example in a mathematical document. They are typically used at the end of a line of text, and serve as a visual signal to the reader that there has been a break in the text.

Proof boxes are commonly used in mathematical texts, but may also be used in other types of documents where a point needs to be emphasized or a break in the text is needed.

How to Create a Proof Box

Creating a proof box in LaTeX is quite simple. There are several packages you can use, but the most popular one is the amsthm package. This package provides a simple command called "qed" that allows you to create a box at the end of a line.

The "qed" command is used at the end of a line where a proof or example ends. For example, if you have a proof that spans several lines, you would call the "qed" command at the end of the last line of the proof. This will insert a small square box at the end of the line.

Here is an example of how to use the "qed" command:

\begin{proof}
Let $a,b \in \mathbb{Z}$. We want to show that $a + b$ is even if and only if both $a$ and $b$ are even.

Suppose $a$ and $b$ are both even. Then there exist integers $k$ and $m$ such that $a = 2k$ and $b = 2m$. Thus,

$$a + b = 2k + 2m = 2(k + m)$$

which is even.

Now suppose $a + b$ is even. Then there exists an integer $n$ such that $a + b = 2n$. Without loss of generality, we may assume that $a > b$. Then $a = 2n – b$ is odd, since $b$ is even. But this contradicts the assumption that $a$ is even. Therefore, $a + b$ is even if and only if both $a$ and $b$ are even. \qed
\end{proof}

Notice that the "qed" command is included at the end of the last line of the proof. This results in a small square box being placed at the end of the line.

Variations of the Proof Box

There are several variations on the standard proof box that you may find useful. For example, you may want to use a different symbol for the box, or you may want to place the box in a different location.

To change the symbol used for the box, you can redefine the "qed" command to use a different symbol. For example, to use a black square instead of a white square, you would use the following code:

\renewcommand\qedsymbol{$\blacksquare$}

To change the location of the box, you can use the \hfill command to place it at the end of the line. For example:

\begin{proof}
Let $a,b \in \mathbb{Z}$. We want to show that $a + b$ is even if and only if both $a$ and $b$ are even.

Suppose $a$ and $b$ are both even. Then there exist integers $k$ and $m$ such that $a = 2k$ and $b = 2m$. Thus,

$$a + b = 2k + 2m = 2(k + m)$$\hfill$\blacksquare$

which is even.

Now suppose $a + b$ is even. Then there exists an integer $n$ such that $a + b = 2n$. Without loss of generality, we may assume that $a > b$. Then $a = 2n – b$ is odd, since $b$ is even. But this contradicts the assumption that $a$ is even. Therefore, $a + b$ is even if and only if both $a$ and $b$ are even. \qed
\end{proof}

In this example, the \hfill command is used to place the black square at the end of the line.

Conclusion

Proof boxes are a simple yet effective way to improve the readability and structure of mathematical documents. Using the amsthm package, users can quickly and easily add proof boxes to LaTeX documents. Furthermore, by redefining commands and using \hfill, users can further customize the appearance and placement of the box. By implementing proof boxes in your documents, you can ensure that readers are able to easily identify important information in your work.

Proofs in Mathematics

Proofs are essential in mathematics. They are used to establish the truth of a mathematical statement or theorem. A proof is a logical argument that shows why a statement is true. Proofs can be short or lengthy, simple or complex, but they all share the common goal of establishing the truth of a mathematical statement.

There are several types of proofs in mathematics, each with its own set of rules and methods. Direct proofs are the simplest type of proof. They involve taking a statement and using known mathematical laws to establish its truth. Indirect proofs, by contrast, involve assuming the negation of the statement and showing that this leads to a contradiction. Induction proofs involve proving a statement for a base case and then showing that it holds for an arbitrary case. There are also many specialized methods of proof, including contradiction, contrapositive, cases, and more.

No matter the type of proof, it is important to be rigorous and precise. Mathematical proofs must follow established rules of logic and be easy to follow and understand. When writing a proof, it is important to clearly lay out your assumptions, your steps, and your final conclusion. By mastering the art of proof, mathematicians can make new discoveries and advance our understanding of the world around us.

LaTeX for Math Typesetting

LaTeX remains the most popular tool for mathematical typesetting. It is an open-source platform that is used by millions of mathematicians, scientists, and researchers worldwide. LaTeX allows users to easily create beautifully typeset mathematical documents using various features, such as symbols, mathematical equations, and special formatting options.

LaTeX has many advantages over traditional word processors. For one, it provides a much more intuitive and user-friendly platform for typesetting mathematical expressions. It also makes it easy to create and manage large documents with many sections, references, and figures. LaTeX comes with a wide variety of templates that you can use to get started with your document. There are also thousands of packages available that allow you to customize your document to your specific needs.

LaTeX has a large and active user community, which means that if you have a question or run into a problem, there is likely someone out there who can help you. Additionally, by using LaTeX, you can create professional-looking documents that are easy to read and understand. Whether you are a student, researcher, or professional mathematician, LaTeX is the ideal tool for your mathematical typesetting needs.

In conclusion, proofs and LaTeX are two important tools used in the field of mathematics. Proofs allow mathematicians to establish the truth of mathematical statements through careful reasoning and logic, while LaTeX allows them to typeset beautiful mathematical documents that are easy to read and understand. By mastering these tools, mathematicians can advance our understanding of the world around us and make new discoveries in their field.

## Popular questions

1. What is a proof box in LaTeX?
A proof box in LaTeX is a small, square box that is used to denote the end of a proof or example in a mathematical document. It serves as a visual signal to the reader that there has been a break in the text.

2. What is the most popular package used to create proof boxes in LaTeX?
The most popular package used to create proof boxes in LaTeX is the amsthm package. It provides a simple command called "qed" that allows you to create a box at the end of a line.

3. Can you customize the appearance of a proof box in LaTeX?
Yes, you can customize the appearance of a proof box in LaTeX. For example, you can change the symbol used for the box by redefining the "qed" command. You can also use the \hfill command to change the location of the box.

4. What is the purpose of using a proof box in LaTeX?
The purpose of using a proof box in LaTeX is to improve the readability and structure of mathematical documents. It allows readers to easily identify important information in a proof or example.

5. What are some other types of proofs in mathematics?
Some other types of proofs in mathematics include indirect proofs, induction proofs, contradiction proofs, contrapositive proofs, and case proofs. Each proof type has its own set of rules and methods, but they all share the common goal of establishing the truth of a mathematical statement.

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