Mathematicians are very guilty of this. However sometimes the arrows are functors in which case you should draw the diagram in my opinion.https://twitter.com/MBarany/status/1194783820404400133 …
-
-
Thanks. Twitter will use this to make your timeline better. UndoUndo
-
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.