def METHOD_NAME(t):
    if t < 0.0:
        return 0.0
    prefactor = weight * math.e / (tau_syn * C_m)
    t1 = (exp(-t / tau_m) - exp(-t / tau_syn)) / (1 / tau_syn - 1 / tau_m) ** 2
    t2 = t * exp(-t / tau_syn) / (1 / tau_syn - 1 / tau_m)
    return prefactor * (t1 - t2)