[微積] 偏微分

[iverson32 (iverson32)]

           1    1
(D.E.) Urr+-Ur+ - Uoo=0  Uoo代表對θ偏微兩次
           r   r^2

       a<=r<b,-∞<=θ<=∞

(B.C.) U(a,θ)=U(b,θ)=0

       -∞<=θ<=∞

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