It really doesn't matter since ∞ isn't a number per se, so arithmetic operations involving it typically result in ∞ anyway :D (meaning 1 + ∞ = ∞, ∞ / ∞ = ∞ .. etc)

wait ∞ / ∞ = ∞ ? x / x = 1 only for { x | x є R } ?

:o