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Using Einstein summation (index) notation, prove the following: points) (a) Vx (Vf) = 0 for any scalar field f. (b) V . (V x A)

Using Einstein summation (index) notation, prove the following: points) (a) Vx (Vf) = 0 for any scalar field f. (b) V . (V x A) = 0 for any vector field A

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