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invex

a. (context mathematics English) 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''.