Hi, I would like to know why is it that gamma(1/2) = squareroot(pi) The other values as well. I don't see why out of all values that the gamma function converges to operations of pi of all things. Is there some kind of relationship to the gamma function and the trigonometric function. I don't see how else one would know that it converges exactly to the square root of pi... One could plug it into a calculator and would get that it's about the square root pi due to the fact that the calculator would round off to so many digits but how does one know it's' exactly the square root of pi? There has to be some other way to know this as I don't see how else this can be known. Thanks.