Erf
 Usage
• Erf[z] 用来给出误差函数  .
Notes
• Erf[z] 是Gaussian分布的积分,表达式为  . • Erf[z]是一个没有不连续分支线的解析函数.
 Further Examples
This is the derivative.
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This is the indefinite integral.
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This is a series expansion around  .
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