Question

一道复变函数题设f(z)在包含原点的区域D内解析,且f^(n)(0)=1,n=0,1,...证明在D内f(z)=e^z

Answer 1

泰勒展开

f(x)=Σ(0到无穷)f^(n)(0)/n!*(x-0)^n=Σ(0到无穷)x^n/n!=e^x