Lie Derivative (brief introduction and special application)
20:08
Gradient in spherical coordinates (derivation using concepts of tensor calculus and linear algebra)
19:52
Functional derivatives and generalization of Euler Lagrange equations in QFT
37:04
From Path Integrals to Perturbation Theory and then to Feynman Diagrams
25:23
Derivation of the Lie algebra of the Lorentz group
3:53
The History of Zero: How Nothing Changed Everything
9:36
why is quantum gravity so hard?
20:38
How convolutions in the path integral lead to the Schrodinger equation
30:25