where "e" denotes the electron charge, "h" denotes Planck's constant, and "i" stands for the number of edge channels. The matrix "Tml" denotes the probability of transmission of a negatively charged particle (i.e. of an electron) from a contact to another contact "m". The net current "Im" in relationship () is made up of the currents towards contact "m" and of the current transmitted from the contact "m" to all other contacts . That current equals the voltage of contact "m" multiplied with the Hall conductivity of per edge channel.