[微積] 疊加問題
z1 z2 (z1+z2)
pf:e * e = e ，z1&z2皆複數
z1 z2 ∞ 1 m ∞ 1 k ∞ n 1 1 k n-k
e *e = Σ ----z1 * Σ -----z2 = Σ Σ ---- * -------- z1 * z2
m=0 m! k=0 k! n=0 k=0 k! (n-k)!
請問最後一個等號怎麼轉換的阿?
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