Articles by Patrick Hedfeld Patrick HedfeldPatrick Hedfeld is a private lecturer at the FOM University of Applied Sciences and Goethe University in Frankfurt am Main. He is a coffee addict and has no friends. On the left you see he is thinking about the cup for at least two hours. https://patrick-hedfeld.de All articles by Patrick Coffee problems19 April 2026Patrick Hedfeld has bean there, modelled thatCan you make something out of nothing?20 September 2018We explore the concept of emptiness in set theory, and explain how zero went from "nothing" to "something"
