def getA(self, freq):
        Mmui = self.MfMui
        Msig = self.MeSigma
        C = self.mesh.edgeCurl

        return C.T*Mmui*C + 1j*omega(freq)*Msig
Function to get the A system.
dataset/ETHPy150Open simpeg/simpeg/SimPEG/MT/Problem3D/Probs.py/eForm_ps.getA