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R 3 <br />
<br />
<br />
<br />
<br />
<br />
(ξ, θ ′<br />
, ϕ ′<br />
) <br />
θ = θ ′<br />
ϕ = ϕ ′<br />
ξ <br />
0 ≤ r ≤ r0 <br />
r = α0ξ, ξ ∈ [0, 1], , α0 = r0. <br />
(1 ≤ j ≤ n) r ∈ [rj−1, rj] <br />
r = αjξ + βj, ξ ∈ [−1, 1], αj = rj − rj−1<br />
2<br />
βj = rj + rj−1<br />
. <br />
2<br />
rn ≤ r ≤ ∞ <br />
u = 1/r <br />
u = 1<br />
r = αn+1(1 − ξ), ξ ∈ [−1, 1], αn+1 = 1<br />
2rn<br />
.