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(r, θ, ϕ) R 3 <br />
(∂/∂r, ∂/∂θ, ∂/∂ϕ) <br />
<br />
er = ∂<br />
∂r , eθ = 1 ∂<br />
r ∂θ , eϕ = 1<br />
rθ<br />
∂<br />
. <br />
∂ϕ<br />
<br />
Σt <br />
fij = diag(1, 1, 1) <br />
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f [a, b] <br />
<br />
f <br />
N <br />
{xi}i∈[1,N] ∈ [a, b] x1 = a xN = b <br />
f(xi)