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1. Vector Field

   Linked via "vector differential operator"

   Differential Operators in Vector Fields
   The utility of vector fields stems largely from the application of the vector differential operator, $\nabla$ (nabla (operator)) or del operator). When the vector field $\mathbf{F}$ is defined on $\mathbb{R}^3$, three primary operations are defined: gradient, divergence, and curl.
   Divergence