It is the product of a Maurer-Cartan frame and its co-frame.
It is the product of a Maurer-Cartan frame and its co-frame. This function appears in the orthogonality constraint used in both the Car- Parrinello method and the Chebyshev rational functions. The t'Hooft symbol combines it with the Levi-Civita symbol, and it is a less general form of the Iverson bracket. Its index usually is represented by square brackets, which indicates its use in discrete time applications rather than its similarly named relation. Often used to represent the identity matrix, FTP, name this mathematical function of two variables that is equal to 1 if the two variables are equal and equal to zero otherwise, a certain delta function that is not the Dirac.
It is the product of a Maurer-Cartan frame and its co-frame.
{Kronecker delta} function