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Jul
29
comment Is there a closed-form equation for $n!$? If not, why not?
@ShreevatsaR: Well, because the n! is formally defined as $n!=\prod_{k=1}^n k$, which is not closed form. en.wikipedia.org/wiki/Closed-form_expression an expression is said to be a closed-form expression if, and only if, it can be expressed analytically in terms of a bounded number of certain "well-known" functions.
Jul
27
awarded  Beta
Jul
27
accepted Is there a general formula for solving 4th degree equations?
Jul
27
asked Is there a general formula for solving 4th degree equations?
Jul
26
comment Algorithm for calculating $A^n$ with as few multiplications as possible
Isn't this a Project Euler problem?
Jul
25
revised What is the meaning of the double turnstile symbol ($\models$)?
edited tags
Jul
25
revised How do proof verifiers work?
edited tags
Jul
25
revised How can there be explicit polynomial equations for which the existence of integer solutions is unprovable?
edited tags
Jul
25
revised How do the Properties of Relations work?
edited tags
Jul
23
accepted What is the most efficient way to determine if a matrix is invertible?
Jul
23
comment What is the most efficient way to determine if a matrix is invertible?
Well, I haven't learned the proof yet... I don't think he even mentioned how it is done...
Jul
23
revised Is there a closed-form equation for $n!$? If not, why not?
edited tags
Jul
23
awarded  Organizer
Jul
23
revised Unital homomorphism
edited tags
Jul
23
revised What are all the homomorphisms between the rings $\mathbb{Z}_{18}$ and $\mathbb{Z}_{15}$?
edited tags
Jul
23
comment What is the most efficient way to determine if a matrix is invertible?
Thanks. I imagine that proving that is quite an enormous amount of work.
Jul
23
revised What is the most efficient way to determine if a matrix is invertible?
added 4 characters in body
Jul
23
comment How do you prove that a prime is the sum of two squares iff it is congruent to 1 mod 4?
@Akhil: It is acceptable to answer your own question.
Jul
23
asked What is the most efficient way to determine if a matrix is invertible?
Jul
22
revised How can you prove that the square root of two is irrational?
added 18 characters in body; edited tags; added 2 characters in body