Given a sequentially Cauchy complete Archimedean ordered field ℝ\mathbb{R} of scalars, let VV be a ℝ\mathbb{R}-real vector space VV, and let f:V→ℝf:V \to \mathbb{R} be a directionally differentiable function valued in scalars. Given a vector w:Vw:V, the directional derivative ∇ w\Del_{w} is pointwise defined as
sequentially Cauchy complete Archimedean ordered field
real vector space
Newton-Leibniz operator
partial derivative
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