English: This image depicts the Dirac delta function of a simple path. Unlike the Dirac delta function for a point which is a scalar field, the Dirac delta function for a path is a vector field. The vector field is 0 everywhere outside of an infinitely thin tube that encloses the path. Inside the tube, the vectors are parallel to the path, and have a magnitude equal to the inverse of the cross-sectional area. The Dirac delta function is the limit as the tube becomes infinitely thin.
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