[Tex/LaTex] How to add space in math mode after a line break

math-modespacing

I want to be able to add some space at the beginning of a new line – in math mode.

What I have now is this:
enter image description here

What I'm aiming for is this:
enter image description here

I tried \hspace but it seems to be ignored when there's no to elements to space between… in other words, this will work:

$x\hspace{1cm} y$

but this will not:

$x\\ \hspace{1cm} y$

It won't let me add space between y and a new line…

Best Answer

Please always post complete documents, but you can align the lines as follows:

enter image description here

\documentclass{article}
\usepackage{amsmath}
\begin{document}
\begin{align*}
G=\{&f_1=a,b,\rightarrow c,\\
&f_2=a\rightarrow b,\\
&f_3=b\rightarrow e,\\
&f_4=c\rightarrow d,e\\
&f_5=e\rightarrow d\}
\end{align*}
\end{document}

Related Solutions

[Tex/LaTex] Force LaTeX to obey spaces in math mode

I would simplify the definition to this one:

\catcode`\<\active
\protected\def<#1>{\ensuremath{\langle\text{\normalfont\sffamily #1\/}\rangle}}

Example:

\documentclass[12pt,a4paper]{article}
\usepackage{amsmath}

\DeclareMathOperator{\instr}{Instr}

\catcode`\<\active
\protected\def<#1>{\ensuremath{\langle\text{\normalfont\sffamily#1\/}\rangle}}

\begin{document}

<cou cou>

$<cou cou>\frac{<cou cou>}{2}$

\[\frac{<cou cou>}{E}\]

$\instr(<cou cou>,E)$

\end{document}

I don't see any advantage in using an \Instr command that hides the semantics. Never use $$...$$ in LaTeX. Also consider that two-letter commands such as \sf are obsolete and should not be used: it's best to stick with the LaTeX2e commands \sffamily and similar ones that suggest more clearly what font attribute we are selecting; \normalfont is used to avoid that the surrounding font can influence the typesetting of the syntactic object.

However, instead of activating <, I suggest you

\protected\def\<#1>{\ensuremath{\langle\text{\normalfont\sffamily#1\/}\rangle}}

and then to input the thing as

\<cou cou>

[Tex/LaTex] Adding Non-breaking space after single character in text mode

It would be a bit fragile to do that in TeX: I'd do the replace with a regex in the editor as you suggest. (If you just wanted to make a ~ in text and a normal space in math that would be easier, but having it work in listings and verbatim would be harder)

For example given

\documentclass{article}

\usepackage{amsmath}

\begin{document}

A new example here will add a "tilde", after single letter, but will skip math mode.
$12 \times A = 128$
\[ a b c = 123\]
and a bit nore text
\begin{align}
a &= b\\
x & = y 
\end{align}

\begin{verbatim}
A new example here will add a "tilde", after single letter,
but will skip math mode.
$12 \times A = 128$
\[ a b c = 123\]
and a bit nore text
\begin{align}
a &= b\\
x & = y 
\end{align}
\end{verbatim}


A new example here will add a "tilde", after single letter, but will skip math mode.
$12 \times A = 128$
\[ a b c = 123\]
and a bit nore text
\begin{align}
a &= b\\
x & = y 
\end{align}

\begin{verbatim}
A new example here will add a "tilde", after single letter,
but will skip math mode.
$12 \times A = 128$
\[ a b c = 123\]
and a bit nore text
\begin{align}
a &= b\\
x & = y 
\end{align}
\end{verbatim}

\end{document}

The command M-x addtilde in emacs produces

\documentclass{article}

\usepackage{amsmath}

\begin{document}

A~new example here will add a~"tilde", after single letter, but will skip math mode.
$12 \times A = 128$
\[ a b c = 123\]
and a~bit nore text
\begin{align}
a &= b\\
x & = y 
\end{align}

\begin{verbatim}
A new example here will add a "tilde", after single letter,
but will skip math mode.
$12 \times A = 128$
\[ a b c = 123\]
and a bit nore text
\begin{align}
a &= b\\
x & = y 
\end{align}
\end{verbatim}


A~new example here will add a~"tilde", after single letter, but will skip math mode.
$12 \times A = 128$
\[ a b c = 123\]
and a~bit nore text
\begin{align}
a &= b\\
x & = y 
\end{align}

\begin{verbatim}
A new example here will add a "tilde", after single letter,
but will skip math mode.
$12 \times A = 128$
\[ a b c = 123\]
and a bit nore text
\begin{align}
a &= b\\
x & = y 
\end{align}
\end{verbatim}

\end{document}

where addtilde is defined by

(defun hidespaceenv (e)
  (goto-char (point-min))
  (while (re-search-forward 
      (if (string-equal e "[") "\\\\\\["
        (if (string-equal e "$") "\\$"
          (concat "\\\\begin{" e "}")))
      nil 1)
    (while (re-search-forward "\\([a-zA-Z]\\)\\(\\s-+\\)\\|\\(\\\\begin\\)" (save-excursion(re-search-forward 
                                  (if (string-equal e "[") "\\\\\\]"
                                    (if (string-equal e "$") "\\$"
                                      (concat "\\\\end{" e "}")))
                                  nil 1) (point)) 1)
      (replace-match "\\1SPACE@@\\2\\3@@" t))))

(defun addtilde ()
  (interactive)
  (mapcar `hidespaceenv (list "verbatim" "align" "equation" "[" "$"))
  (goto-char (point-min))
  (while (re-search-forward "\\(\\(^\\|\\s-+\\)[a-zA-Z]\\)\\s-+" nil 1)
    (replace-match "\\1~"))
  (goto-char (point-min))
  (while (re-search-forward "SPACE@@\\(\\s-+\\|\\\\begin\\)@@" nil 1)
    (replace-match "\\1")))

Best Answer

Related Solutions

[Tex/LaTex] Force LaTeX to obey spaces in math mode

[Tex/LaTex] Adding Non-breaking space after single character in text mode

Related Question