5

Just wondering how I can produce a south-east double arrow like this:

enter image description here

Ok great there is a reverse lookup for latex symbols .. my new favourite link. thank you !

but i still think this is a valid question. good way to find the next important link.

also this:

enter image description here

user175199
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    You could just use \rotatebox{-45}{$\Rightarrow$}, where \rotatebox requires the graphicx package. See here for more informations on how to look up symbols. –  Jan 02 '19 at 03:22
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    A variation on @marmot's suggestion: If the southeast-pointing double arrow is a relational operator, consider defining a macro called \SEarrow as follows: \newcommand\SEarrow{\mathrel{\rotatebox[origin=c]{-45}{$\Rightarrow$}}}. Then, in the body of the document, write $X\SEarrow Y$. – Mico Jan 02 '19 at 03:37

2 Answers2

8

Requires LuaLaTeX (or XeLaTeX):

\documentclass{article}
\usepackage{unicode-math}
\begin{document}
$\Searrow$
\end{document}

enter image description here

You could also load the symbol from another font, e.g. txfonts.

\documentclass{article}
\DeclareSymbolFont{symbolsC}{U}{txsyc}{m}{n}
\DeclareMathSymbol{\Searrow}{\mathrel}{symbolsC}{117}
\begin{document}
$\Searrow$
\end{document}

enter image description here

Henri Menke
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    +1. You may want to add that \Searrow, \Nearrow, etc are provided automatically by the newtxmath and newpxmath font packages. (In a way, this isn't surprising as newtxmath and newpxmath are derived from txfonts and pxfonts, respectively.) – Mico Jan 02 '19 at 06:53
6

The newtxmath and newpxmath math font packages provide macros called \Nearrow, \Nwarrow, \Swarrow and \Searrow. These arrows (a) take up the same width as \Rightarrow and \Leftarrow, respectively, and (b) are 1.4 times as long as \Rightarrow and \Leftarrow.

If you either don't wish to use the newtxmath and newpxmath math font packages -- say, because you don't like or aren't allowed to use Times Roman and Palatino fonts -- or find that the arrows produced by \Nearrow, \Nwarrow, \Swarrow and \Searrow look too long, it's straightforward (by using the \rotatebox macro of the graphicx package) to create angled double-struck arrows that (a) take up the same width as \Rightarrow and (b) are as long \Rightarrow as.

enter image description here

\documentclass{article}
\usepackage{newtxmath} % or: \usepackage{newpxmath}

\usepackage{graphicx} % for '\rotatebox' macro
\newcommand\myrot[1]{\mathrel{\rotatebox[origin=c]{#1}{$\Rightarrow$}}}
% create four new angled double-struck arrows
\newcommand\NEarrow{\myrot{45}}
\newcommand\NWarrow{\myrot{135}}
\newcommand\SWarrow{\myrot{-135}}
\newcommand\SEarrow{\myrot{-45}}

\begin{document}
\[
\begin{array}{c}
a \Rightarrow b\\ \hline
a \Nearrow b\\
a \Nwarrow b\\
a \Swarrow b\\
a \Searrow b\\ \hline
a \NEarrow b\\
a \NWarrow b\\
a \SWarrow b\\
a \SEarrow b
\end{array}
\]
\end{document}
Mico
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