A Dozen Ways to Formulate the Kronecker Delta Function

Edit: The Christoffel symbols of the second kind are not referred to as Riemann-Christoffel symbols. It is the Riemann curvature tensor that is sometimes referred to as the Riemann-Christoffel tensor.

The fields of math featured in this video are Differential Calculus, Integral Calculus, Linear Algebra, Complex Analysis, Tensor Calculus, Lie Group Theory, and Vertex Operator Algebras.