A vector field is a function that assigns a vector to each point . The gradient is an example of a vector field. a 2D vector field (sin y, sin x) To understand the rate of change of a vector field, there are two basic quantities: divergence and curl. Divergence describes how much a field shrink/expand and curl describes how much is the field spinning.

In 2D and 3D, a vector field is often written as

where , , are scalar functions

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