I am studying a code. One of key part is
Return a list representing the number of times each IRR is present in the permutation matrix representation.
Suppose we have:
- character table
- number of inequivalent irreducible representations (just find the length of character table)
- group order
- conjugacy classes matrices
The code is the following:
(def get_IRR_degeneracies(self), particularly)
My question is the following key formula:
total=total +float(len(matricies[j])/group_order)* np.conj(np.complex(characters[i][j]))* np.trace(matricies[j])
What is this formula? Where can I find this formula?