Hodgkin-Huxley Nerve Model



U(t) for $0\leq t\leq 30$; membrane potential of the Hodgkin-Huxley equation; six trajectories U(0)=U0, with V1(0)=0.31, V2(0)=0.05, V3(0)=0.6 and Ia=0; U0=-5.0/-5.2/-5.4/-5.6/-5.8/-6.0