[微積] 齊性邊界值問題
y"+2y'+(λ+1)y = 0, y(0)=0, y(1)=0, find eigenvalues and eigenfunctions.
Sol:
2 2
(D +2D +λ+1)y=0, (D+1) +λ=0, D =-1±√-λ
2
當-λ>0, 令-λ=β , β>0
我的問題是爲什麼要宣告β>0
有什麼意義嗎 ?
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