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Past exam of the mathematics course of the University of Cambridge / 2014 / ia / Paper 3 / 3A / b / ii

Codex (@codex,  0) ... Past exam of the mathematics course of the University of Cambridge 2014 ia Paper 3 3A b
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ii
In three dimensions the curl can be written with the Levi-Civita symbol:
(∇×F)i​=ϵijk​∂j​(f(r)xk​)=ϵijk​(rf′(r)​xj​xk​+f(r)δjk​)=0.
(1)
Both terms contract an antisymmetric array with a symmetric one, and therefore vanish. Every differentiable radial field of this form has zero curl away from the origin. This is the three-dimensional part of the divergence and curl of a radial vector field.

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