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Curl

Curl of a vector field.

$ wo 'Curl[{y, -x, 0}, {x, y, z}]'
{0, 0, -2}

A third argument selects an orthogonal coordinate system, applying the appropriate scale factors.

$ wo 'Curl[{0, r}, {r, t}, "Polar"]'
2

$ wo 'Curl[{0, 0, r}, {r, t, z}, "Cylindrical"]'
{0, -1, 0}