Gradient of a scalar
Craig, Homer V. Department of Mathematics, University of Texas, Austin, Texas.
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The result of the application of the distributive vector differential operator ∇, ∇ = i + j + k , to a differentiable scalar function S(x, y, z); thus ∇S = i + j + k. The letters i, j, k are symbols for the base vectors associated with x, y, z. The gradient of S is also denoted by grad S, while the symbol ∇ is usually called del and less frequently nabla.
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