$ j =\displaystyle\frac{ I }{ S }$

j = I / S

$ I = S c v $

I = S * c * v

$ \kappa =\displaystyle\frac{ z }{ \mid z \mid } \mu_e c $

kappa = z * mu_e * c /abs( z )

$ j =- \kappa \displaystyle\frac{ dV }{ dx }$

j =- kappa * dV / dx

$ j =- D \displaystyle\frac{ dc }{ dx }$

j =- D *( dc / dx )

$ D =\displaystyle\frac{ \mu_e R_C T }{\mid z \mid F }$

D = mu_e * R_C * T /abs( z )* F )

$ dV =\displaystyle\frac{ R_C T }{ z F }\displaystyle\frac{ dc }{ c }$

dV = ( R_C * T /( z * F ))* dc / c

$ V_m =-\displaystyle\frac{ R_C T }{ F }\ln\displaystyle\frac{ c_1 }{ c_2 }$

V_m = -( R_C * T / F )*log( c_1 / c_2 )

$dc=c_2-c_1$

dc = c_2 - c_1

$c_m=\sum_i\mid z_i\mid c_i$

c_m=sum_i |z_i| c_i

$ c_m =\mid z_1 \mid c_1 $

c_m =abs( z_1 ) * c_1

$ c_m = \mid z_1\mid c_1 + \mid z_2\mid c_2 $

c_m =abs( z_1 )* c_1 +abs( z_2 )* c_2

$ c_m = \mid z_1\mid c_1 + \mid z_2\mid c_2 + \mid z_3\mid c_3 $

c_m =abs( z_1 )* c_1 +abs( z_2 )* c_2 +abs( z_3 )* c_3