Quite interesting to see [Hans] Bethe Ansatz on there. I wasn't familiar with it, apparently it started as an Ansatz and Bethe corrected it into a theory. But t

Quite interesting to see [Hans] Bethe Ansatz on there. I wasn't familiar with it, apparently it started as an Ansatz and Bethe corrected it into a theory. But this all happened more than ten years before Feynman was doing physics.