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∇ · D0 = 0 W <br />
W µ <br />
W θ ϕ <br />
∂rW η W η W r<br />
+ − <br />
r r<br />
W D0 <br />
<br />
<br />
A =<br />
∂W η<br />
∂r<br />
+ W η<br />
r<br />
r W<br />
− . <br />
r<br />
D0 = 0 ⇐⇒ W µ = 0 A = 0. <br />
<br />
<br />
<br />
<br />
V µ<br />
A V r V η <br />
<br />
(∆V) η = ∆V η r V<br />
+ 2<br />
, <br />
r2 (∆V) µ = ∆V µ . <br />
µ <br />
<br />
∂ 2 V µ<br />
∂t 2 = ∆V µ . <br />
A <br />
<br />
∂2A = ∆A. <br />
∂t2 <br />
V <br />
<br />
<br />
<br />
F <br />
Φ Ψ <br />
F = ∇ × (Ψk) + ∇ × ∇ × (Φk) <br />
k <br />
<br />
eρ