Adjective
English Wikipedia has an article on:invexWikipedia
invex (not comparable)
(mathematics) A differentiable function ƒ from R to R is invex if there exists a vector valued function g such that
f
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−
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≥
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⋅
∇
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,
{\displaystyle f(x)-f(u)\geq g(x,u)\cdot \nabla f(u),\,}
for all x and u.