invex (suomeksi)

Määritelmät:

(lb, en, mathematics) A differentiable function ''ƒ'' from '''R'''^''n'' to '''R''' is invex if there exists a vector valued function ''g'' such that $f(x) - f(u) \geq g(x, u) \cdot \nabla f(u), \,$ for all ''x'' and ''u''.