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You have AlphaNa = 0.1 * f(0.1*(VoltageDelta-10.0)) where $$f(x)=\frac{x}{1-\exp(-x)}$$ The limit for $x\to 0$ can actually be interpreted as difference quotient, you might also appeal to l'Hopital, to find that $f(x)\to 1$. So if you want to play it safe, you can employ a 3-tier or 4-tier implementation of this function def f(x): if abs(x)<1e-12: ...