Non-trivial values of error function erf(x)\operatorname{erf}(x)?

The so called error function erf(x) is defined as
erf(x)=2πx0et2dt,
and it is well known that erf()=1.

Are there any other known closed-form values of erf(x), except for erf(0) and erf(±)?

Answer

If the values aren’t listed on the Wolfram function page, I would be surprised if you found them anywhere else. The only listed closed form values are for 0, ±, and ±i. However, you can find various equivalent formulations, continued fractions, and the like on that page. A good reference, generally, for most well-known functions.

Attribution
Source : Link , Question Author : Mårten W , Answer Author : HackerBoss

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