= Equal open probability with unequal ion-channel relaxation times
{title2=$p_\infty=a/(a+b),\quad\tau=(a+b)^{-1}$}
Multiplying opening and closing rates by the same factor preserves equilibrium open <probability> but rescales the relaxation and dwell times. At equal opening and closing rates, $p_\infty=1/2$ and relaxation is twice as fast as the reciprocal mean individual-state dwell. A two-state constant-voltage model cannot alone produce activation followed by inactivation during a maintained step.
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