Goldman Equation

The Goldman–Hodgkin–Katz voltage equation, more commonly known as the Goldman equation, is used in cell membrane physiology to determine the reversal potential across a cell's membrane, taking into account all of the ions that are permeant through that membrane.

The discoverers of this are David E. Goldman of Columbia University, and the English Nobel laureates Alan Lloyd Hodgkin and Bernard Katz.

The GHK voltage equation for ${\displaystyle M}$ monovalent positive ionic species and ${\displaystyle A}$ negative:

This results in the following if we consider a membrane separating two ${\displaystyle \mathrm {K} _{x}\mathrm {Na} _{1-x}\mathrm {Cl} }$-solutions:

...
Wikipedia