inverse

Cowgirl is the inverse of missionary.

Uninstalling is the inverse of installation.

The inverse of a:b is b:a.

The inverse P‘ of a point P is the point on a ray from the center O through P such that OP × OP‘ = r² or the set of all such points.

"Anything that isn't a dog doesn't go to heaven" is the inverse of "All dogs go to heaven." More generally, ¬ mathsf p→¬ mathsf q is the inverse of mathsf p→ mathsf q and is equivalent to the converse proposition mathsf q→ mathsf p.

The additive inverse of x is -x, as x-x=0, as 0 is the additive identity element.

The multiplicative inverse of x is x⁻¹, as x⨯x⁻¹=1, as 1 the multiplicative identity element.

The compositional inverse of a function f is f⁻¹, as ff⁻¹= mathit I, as mathit I is the identity function. That is, ∀x,f(f⁻¹(x))= mathit I(x)=x.

If the player... be determined to try his luck on the inverse, he must place his money on a yellow circle, or rather a collection of circles, situated at the extremity of the table.