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

**Published:** June 8, 2024
**Author:** Mathologer
**Source:** YouTube — 3Blue1Brown
**Language:** en-US
**HTML:** https://aiqazaqstan.com/en/articles/petr-s-miracle-why-was-it-lost-for-100-years-mathologer-masterclass

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 :)…

> From the original source: **YouTube — 3Blue1Brown**
> [Read full article at YouTube — 3Blue1Brown](https://www.youtube.com/watch?v=WLAW5yz5O3E)

**Tags:** #Microsoft #YouTube

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