Unnumbered source etymology
Original entry ↗adj
Selected source glosses provide context, not a complete modern definition inventoryOf a differentiable function f:ℝⁿ→ℝ, being such that there exists a vector valued function g such that f(x)-f(u)≥g(x,u)·∇f(u),, for all x and u.
Introduced by Morgan A. Hanson in 1981 as a generalization of convex.
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