invex

Introduced by Morgan A. Hanson in 1981 ^[1] as a generalization of convex.

invex (not comparable)

1. (mathematics) Of a differentiable function ${\displaystyle f:\mathbb {R} ^{n}\to \mathbb {R} }$, being such that there exists a vector valued function g such that ${\displaystyle f(x)-f(u)\geq g(x,u)\cdot \nabla f(u),\,}$ for all x and u.

• invexity

• Vixen, vixen