# Arrow structure with under arrows

So I was transcribing a lecture for a college asignment and when I got to this formula I just don't know how to code it. Do someone know how to code it in Latex? Thanks in advance.

This is the figure I want to code

Such diagrams can be produced with tikz-cd, or, practically equivalently the cd library of tikz. You probably want the bounding box to be accurate, too, to which end you may use the bbox library.
\documentclass{article}