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Short Math Guide for L

Michael Downes, updated by Barbara Beeton

American Mathematical Society

Version 2.0 (2017/12/22), currently available from a link at

https://www.ams.org/tex/amslatex

Contents

1 Introduction 3

2 Inline math formulas and displayed equations 3

2.1 The fundamentals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2.2 Automatic numbering and cross-referencing . . . . . . . . . . . . . . . . . . 5

3 Math symbols and math fonts 6

3.1 Classes of math symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.2 Some symbols intentionally omitted here . . . . . . . . . . . . . . . . . . . . 6

3.3 Alphabets and digits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3.1 Latin letters and Arabic numerals . . . . . . . . . . . . . . . . . . . 7

3.3.2 Greek letters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3.3.3 Other “basic” alphabetic symbols . . . . . . . . . . . . . . . . . . . . 8

3.3.4 Math font switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

3.3.5 Blackboard Bold letters (msbm; no lowercase) . . . . . . . . . . . . . 9

3.3.6 Calligraphic letters (cmsy; no lowercase) . . . . . . . . . . . . . . . . 9

3.3.7 Non-CM calligraphic and script letters . . . . . . . . . . . . . . . . . 9

3.3.8 Fraktur letters (eufm) . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.4 Miscellaneous simple symbols . . . . . . . . . . . . . . . . . . . . . . . . . . 9

3.5 Binary operator symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.6 Relation symbols: < = >  ∼ and variants . . . . . . . . . . . . . . . . . . 10

3.7 Relation symbols: arrows . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

3.8 Relation symbols: miscellaneous . . . . . . . . . . . . . . . . . . . . . . . . 11

3.9 Cumulative (variable-size) operators . . . . . . . . . . . . . . . . . . . . . . 12

3.10 Punctuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.11 Pairing delimiters (extensible) . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.12 Nonpairing extensible symbols . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.13 Extensible vertical arrows . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3.14 Math accents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

3.15 Named operators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

4 Notations 13

4.1 Top and bottom embellishments . . . . . . . . . . . . . . . . . . . . . . . . 13

4.2 Extensible arrows . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.3 Aﬃxing symbols to other symbols . . . . . . . . . . . . . . . . . . . . . . . 14

4.4 Matrices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.5 Math spacing commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

4.6 Dots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.7 Nonbreaking dashes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.8 Roots . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

4.9 Boxed formulas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Short Math Guide for L

X, version 2.0 (2017/12/22) 3

1. Introduction

This is a concise summary of recommended features in L

X and a couple of extension

packages for writing math formulas. Readers needing greater depth of detail are referred

to the sources listed in the bibliography, especially [Lam], [AMUG], and [LFG]. A certain

amount of familiarity with standard L

X terminology is assumed; if your memory needs

refreshing on the L

X meaning of command, optional argument, environment, package,

and so forth, see [Lam].

Most of the features described here are available to you if you use L

X with two ex-

tension packages published by the American Mathematical Society: amssymb and amsmath.

Thus, the source ﬁle for this document begins with

\documentclass{article}

\usepackage{amssymb,amsmath}

The amssymb package might be omissible for documents whose math symbol usage is rela-

tively modest; in Section 3, the symbols that require amssymb are marked with

(font

msam or msbm). In Section 3.3, a few additional fonts are included; the necessary packages

are identiﬁed there.

Many noteworthy features found in other packages are not covered here; see Section 10.

Regarding math symbols, please note especially that the list given here is not intended to be

comprehensive, but to illustrate such symbols as users will normally ﬁnd already present in

their L

X system and usable without installing any additional fonts or doing other setup

work.

If you have a need for a symbol not shown here, you will probably want to consult The

Comprehensive L

X Symbol List [CLSL]. If your L

X installation is based on T

X Live,

and includes documentation, the list can also be accessed by typing texdoc comprehensive

at a system prompt.

2. Inline math formulas and displayed equations

2.1. The fundamentals. Entering and leaving math mode in L

X is normally done

with the following commands and environments.

inline formulas displayed equations

$ . . . $

\[...\] unnumbered

\begin{equation*}

. . .

\end{equation*}

unnumbered

\begin{equation}

. . .

\end{equation}

automatically

numbered

Note 1. Do not leave a blank line between text and a displayed equation. This allows a page break at that

location, which is bad style. It also causes the spacing between text and display to be incorrect, usually

larger than it should be. If a visual break is desired in the input, insert a line containing only a % at the

beginning. Leave a blank line between a display and following text only if a new paragraph is intended.

Note 2. Do not group multiple display structures in the input (\[...\], equation, etc.). Instead, use a

multiline structure with substructures (split, aligned, etc.) as appropriate.

Note 3. The alternative environments \begin{math} . . . \end{math} and

\begin{displaymath} . . . \end{displaymath} are seldom needed in practice. Using the plain T

X notation

$$ . . . $$ for displayed equations is strongly discouraged. Although it is not expressly forbidden in L

it is not documented anywhere in the L

X book as being part of the L

X command set, and it interferes

with the proper operation of various features such as the fleqn option.

Note 4. The eqnarray and eqnarray* environments described in [Lam] are strongly discouraged because

they produce inconsistent spacing of the equal signs and make no attempt to prevent overprinting of the

equation body by the equation number.

Environments for handling equation groups and multiline equations are shown in Table 1.

Short Math Guide for L

X, version 2.0 (2017/12/22) 4

Table 1: Multiline equations and equation groups

(vertical lines indicate nominal margins).

\begin{equation}\label{xx}

\begin{split}

a& =b+c-d\\

& \quad +e-f\\

& =g+h\\

& =i

\end{split}

\end{equation}

a = b + c −d

+ e −f

= g + h

= i

(1.1)

\begin{multline}

a+b+c+d+e+f\\

+i+j+k+l+m+n\\

+o+p+q+r+s

\end{multline}

a + b + c + d + e + f

+ i + j + k + l + m + n

+ o + p + q + r + s (1.2)

\begin{gather}

a_1=b_1+c_1\\

a_2=b_2+c_2-d_2+e_2

\end{gather}

= b

+ c

(1.3)

= b

+ c

− d

+ e

(1.4)

\begin{align}

a_1& =b_1+c_1\\

a_2& =b_2+c_2-d_2+e_2

\end{align}

= b

+ c

(1.5)

= b

+ c

− d

+ e

(1.6)

\begin{align}

a_{11}& =b_{11}&

a_{12}& =b_{12}\\

a_{21}& =b_{21}&

a_{22}& =b_{22}+c_{22}

\end{align}

= b

(1.7)

= b

+ c

(1.8)

\begin{alignat}{2}

a_1& =b_1+c_1& &+e_1-f_1\\

a_2& =b_2+c_2&{}-d_2&+e_2

\end{alignat}

= b

+ c

+ e

− f

(1.9)

= b

+ c

− d

+ e

(1.10)

\begin{flalign}

a_{11}& =b_{11}&

a_{12}& =b_{12}\\

a_{21}& =b_{21}&

a_{22}& =b_{22}+c_{22}

\end{flalign}

= b

(1.11)

= b

+ c

(1.12)

Note 1. Applying * to any primary environment will suppress the assignment of equation numbers. How-

ever, \tag may be used to apply a visible label, and \eqref can be used to reference such manually tagged

lines. Use of either * or a \tag on a subordinate environment is an error.

Note 2. The split environment is something of a special case. It is a subordinate environment that can

be used as the contents of an equation environment or the contents of one “line” in a multiple-equation

structure such as align or gather.

Note 3. The primary environments gather, align and alignat have subordinate “-ed” counterparts

(gathered, aligned and alignedat) that can be used as components of more complicated displays, or

within in-line math. These “-ed” environments can be positioned vertically using an optional argument

[t], [c] or [b].

Note 4. The name flalign is meant as “full length”, not “ﬂush left” as often mistakenly reported. However,

since a display occupying the full width will often begin at the left margin, this confusion is understandable.

The indent applied to flalign from both margins is set with \multlinegap.

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