Uploaded May 2018 | Updated September 2026, 20 hours ago
In this video, I prove the Palatini identity for the variation of the Riemann curvature tensor and the variation of the Ricci curvature tensor.
Superfluid Helium Resonance Experiment video:
youtu.be/unUNQNmuvUQ
Quantum Field Theory Lecture Series:
youtube.com/playlist?list=PLSpklniGdSfSsk7BSZjONcfhRGKNa2uou
In this video, I prove the Palatini identity for the variation of the Riemann curvature tensor and the variation of the Ricci curvature tensor.
Superfluid Helium Resonance Experiment video:
youtu.be/unUNQNmuvUQ
Quantum Field Theory Lecture Series:
youtube.com/playlist?list=PLSpklniGdSfSsk7BSZjONcfhRGKNa2uou



![Annoying Ass Spinor Spherical Harmonics Identity | Quantum Mechanics
In this video, I show how to do a tricky homework problem that I had a while ago.
My Quantum Mechanics Lecture Series:
https://www.youtube.com/playlist?list=PLSpklniGdSfSsAFCzO-YWGlJ4TNv8sMdy
Typo: At 5:43, it should be Y(l , m+½) = (Sqrt { [ ( 2l + 1 ) ÷ 4π ] ⋅ ( l − m − ½ )! ÷ ( l + m + ½ )! } )⋅[exp i(m+½)φ]⋅P(l , m+½) Annoying Ass Spinor Spherical Harmonics Identity | Quantum Mechanics](https://i.ytimg.com/vi/ssdQWpWru-E/mqdefault.jpg)






