Mathematics Stack Exchange is a question and answer site for people studying math at any level and professionals in related fields. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

My TI-83 calculator doesnt allow me to do this, but using Windows calculator, I can compute the factorial of say 5.8. What does this mean and how does it work?

share|cite|improve this question
As I recall, these calculators can compute factorials of half-integers. But yes, you need $\Gamma(z)$ in general. – J. M. Nov 28 '10 at 1:29
up vote 16 down vote accepted

Perhaps you're looking for the Gamma function. It restricts to the usual factorial on natural numbers.

Wikipedia's article on Gamma function

share|cite|improve this answer
Wow thats crazy. Thanks – maq Nov 27 '10 at 20:15

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.