Math & Science ⇒ How to write text through an arrow

[peaches20]

Hi,

I need to literally write on top of an arrow. For example
>-(viii)->>
The (viii) needs to be on top of the doublehead rightarrow with a tail

I am using

Code: Select all

\documentclass{lmcs}
\usepackage{amssymb}
\usepackage{graphicx}

I came up with this:

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$\rightarrowtail \!\!\!\!\!\rightarrow  
\mbox{\tiny \hspace*{-.22in}\!\!\!\!{\rm (viii)}}$ and the etc.
by $\rightarrowtail \!\!\!\!\!\rightarrow  
\mbox{\tiny \hspace*{-.22in}\!\!\!\!{\rm (viii)}}$

Is there an easier way to do this?

Thanks,
Peaches

[Stefan Kottwitz]

Hi Peaches!

It could be easier with \twoheadrightarrow of amssymb, or using that one this way

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\DeclareRobustCommand\longtwoheadrightarrow
     {\relbar\joinrel\twoheadrightarrow}

or the \xtwoheadrightarrow{...} command of the extpfeil package.

The most flexible solution would be using TikZ and its arrows.meta library that provides a lot of arrow styles and lots of ways for customization.

Stefan

[fportales]

Hello

I did something similar for my thesis. The code

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\newcommand{\onshell}{\overset{\text{on}}{=}}

creates the command \onshell that writes "on" over the = symbol.

Hope this helps!