(For masochists only.) Prove product rules (ii) and (vi). Refer to Prob. 1.22 for the definition of (A · ∇)B.
Refrence: (ii) and (vi).
Reference: Prob. 1.22:
(a) If A and B are two vector functions, what does the expression (A · ∇)B mean?
(That is, what are its x, y, and z components, in terms of the Cartesian components
of A, B, and ∇?)
(b) Compute (ˆr · ∇)ˆr, where ˆr is the unit vector defined in Eq. 1.21.
(c) For the functions in Prob. 1.15, evaluate (va · ∇)vb.
Reference: Eq. 1.21:
Prove product rules (i), (iv), and (v).
(i) ∇( f g) = f ∇g + g∇ f,
(iv) ∇ · (A × B) = B · (∇ × A) − A · (∇ × B),
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