PETR'S MIRACLE: Why was it lost for 100 years? (Mathologer Masterclass)

描述

Today’s topic is the Petr-Douglas-Neumann theorem. John Harnad told me about this amazing result a couple of weeks ago and I pretty much decided on the spot that this would be the next Mathologer video. I really had a lot of fun bringing this one to life, maybe too much fun :) Very good Wiki page on the Petr–Douglas–Neumann theorem https://en.wikipedia.org/wiki/Petr-Douglas-Neumann_theorem Napoleon's theorem and the PDN theorem at Cut-the-knot https://www.cut-the-knot.org/ctk/Napolegon.shtml Petr's original paper https://dml.cz/handle/10338.dmlcz/120936 Worth a look for eigenpolygon deco