Julian Barnes - So a) To what extent might human relationship be expressed...

So a) To what extent might human relationship be expressed in mathematical or logical formula? And b) If so, what signs might be placed between the integers? Plus and minus, self-evidently; sometimes multiplication, and yes, division. But these signs are limited. Thus an entirely failed relationship might be expressed in terms of both loss/minus and division/reduction, showing a total of zero; whereas an entirely successful one can be represented by both addition and multiplication. But what of most relationships? Do they not require to be expressed in notations which are logically improbable and mathematically insoluble?