"Aligned" math environments with arrows for comments
This package provides an environment WithArrows which is similar to the environment aligned of amsmath (and mathtools), but gives the possibility to draw arrows on the right side of the alignment. These arrows are usually used to give explanations concerning the mathematical calculus presented. The package requires the following other LaTeX packages: expl3, footnote, l3keys2e, tikz, and xparse.
You can contact the maintainers of this package via email at
texlive dash maintainers at fedoraproject dot org.