# Incompleteness Notes > Young man, in mathematics you don't understand things. You just get used to them. > *John von Neumann* Complete notes in Hebrew for one of the best and worst courses I ever took: "Incompleteness and Undecidability in Formal Languages", by [Assaf Hasson](http://www.math.bgu.ac.il/~hassonas/index.html) at Ben-Gurion University. Read and weep. PDF version available on https://yuvadm.github.io/incompleteness-notes/notes.pdf HTML version for quick viewing (but horrible rendering) is available on https://yuvadm.github.io/incompleteness-notes/