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Vector calculus identities - Wikipedia
4.1: Gradient, Divergence and Curl - Mathematics LibreTexts
The curl of a gradient is zero - Math Insight
4.6: Gradient, Divergence, Curl, and Laplacian
Curl (mathematics) - Wikipedia
Calculus III - Curl and Divergence - Pauls Online Math Notes
Gradient, divergence, and curl - MIT
16.5: Divergence and Curl - Mathematics LibreTexts
16.5 Divergence and Curl - Whitman College