find a power series (centered at the origin) satisfying the following ODE
zf''(z)+f'(z)+zf(z)=0
assueme f(0) =1 and simplify the result, using sigma notation
hint: f(z)=sigma(n=0->∞)a(n)*z^n=a(0)+a(1)z+a(2)z^2+a(3)z^3+...
求解此題?
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