Goldman-Hodgkin-Katz multi-ion membrane equation

GHK voltage equation V_m = (RT/F) ln[(P_K[K]_o + P_Na[Na]_o + P_Cl[Cl]_i)/(P_K[K]_i + P_Na[Na]_i + P_Cl[Cl]_o)] is the steady-state of the Nernst-Planck drift-diffusion PDE under the constant-field assumption. Generalises Nernst potential…