Due to the exponential, this becomes very large very quickly for low values (not sure how low Ramage Resistance can go, but already -50 doubles damage taken (Damage Reduction = +100%), if it is -100, Damage taken =+300%. And obviously asymptotes to -100% as Damage Resistance goes to infinity (so diminishing returns).
VERY interesting subject. I am usually really great with math.
Is there a chance you (or someone) else could put that math in a different format? I am not tracking what you did, I think this has to do with me not being as great with math as I thought. Thanks in advance.