Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>
\tau{{\text{d}}\over{\text{d}}t}u=-(u-u_{\rm rest})+\Delta_{T}\,\exp\left({u-\theta_{rh}\over\Delta_{T}}\right)+R I
Default parameters: \tau=10 ms, \Delta_T=3 mV, \theta_{rh} = -50 mV, u_{rest} = -65 mV, R=10 M\Omega, I=2.2 nA, firing threshold u_{thr}=-45 mV.
\tau=10
\Delta_T=3
\theta_{rh} = -50 mV
u_{rest} = -65
R=10 M\Omega
I=2.2 nA
u_{thr}=-45 mV
