What is the opposites of opposites property?

Answer 1

Ductility is "The ability to bend or flex". Stiffness, rigidity, and hardness come to mind. If a metal is hard it isn't Ductile.

Answer 2

I assume that the opposites property means the following:

If you are given a number x and an operation ~ (which may be addition, or multiplication or anything else), the opposite of x is another number y such that x ~ y is the identity element for the operation over that set.

Thus, if ~ is addition, then the opposite of x is -x

and if ~ is mulitiplication , then the opposite of x is 1/x.

If that assumption is correct, then the opposite of the opposites property is that there is no number y that meets this requirement.

Answer 3

When you add a number to its opposite you get zero a+(-a)=0

Answer 4

Possibly communal land/goods, in as far as property referring to something that is owned by an individual.