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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §15.1 Vector Fields, #1 · Multivariable Calculus · Vector calculus

… (constant field)

Find a potential f(x, y) for the gradient fields. Draw the streamlines perpendicular to the equipotentials f(x, y) = c.

$F = i + 2 j$ (constant field)

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §15.1 Vector Fields, #1

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