I would like to draw adjunction arrows in LaTeX, i.e. something like this:
Possibly, I would also like to be able to name the arrows (but I can use \stackrel or similar, if not). Is there a package containing this symbol somewhere?
Best Answer
Here's a possibility, with a very small symbol in the middle.
I wrote the extpfeil package, which allows creating new extensible arrow types (using the same mechanism which amsmath uses internally for its build-in arrows).
This will be included in the next version of the package - but I'm not sure when this will be. (You can grab it from Github, though.) This is a screenshot from the package documentation:
The package does not yet provide support for three parallel arrows – you would need something analogous to \bigRelbar which draws three lines, and something analogous to \bigtwoarrowsleft which draws three arrows.
Best Answer
Here's a possibility, with a very small symbol in the middle.
A version where you can choose, with
\adjunction*
, to place the labels above and below.