test page

\(V_m = \frac{RT}{F} \ln \left( \frac{P_{\text{K}}[K^+]_{\text{out}} + P_{\text{Na}}[Na^+]_{\text{out}}}{P_{\text{K}}[K^+]_{\text{in}} + P_{\text{Na}}[Na^+]_{\text{in}}} \right)
\)