The so called

error functionerf(x) is defined as

erf(x)=2√π∫x0e−t2dt,

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*