4
# Hodgkin Huxley equations
v v=-65,m=.052,h=.596,n=.317
p vna=50,vk=-77,vl=-54.4,gna=120,gk=36,gl=.3,c=1,i=0
u am 1 .1*(arg1+40)/(1-exp(-(arg1+40)/10))
u bm 1 4*exp(-(arg1+65)/18)
u ah 1 .07*exp(-(arg1+65)/20)
u bh 1 1/(1+exp(-(arg1+35)/10))
u an 1 .01*(arg1+55)/(1-exp(-(arg1+55)/10))
u bn 1 .125*exp(-(arg1+65)/80)
oV (I - gna*h*(v-vna)*m^3-gk*(v-vk)*n^4-gl*(v-vl))/c
om am(v)*(1-m)-bm(v)*m
oh ah(v)*(1-h)-bh(v)*h
on an(v)*(1-n)-bn(v)*n
d