3,794 reputation
21753
bio website google.com/profiles/walkraft
location Sydney, Australia
age 26
visits member for 3 years, 9 months
seen Mar 24 at 3:59
  • Bachelor of Science (Adv Maths) with Honors in Computer Science from USYD
  • Programming C/C++/Java/Python/Objective C/C#/Javascript/PHP

Jul
21
revised Prove that $(n-1)! \equiv -1 \pmod{n}$ iff $n$ is prime
added 30 characters in body
Jul
21
comment What are all the homomorphisms between the rings $\mathbb{Z}_{18}$ and $\mathbb{Z}_{15}$?
No upvotes left today :-(
Jul
21
revised Prove that $(n-1)! \equiv -1 \pmod{n}$ iff $n$ is prime
added 1066 characters in body; deleted 2 characters in body
Jul
21
revised Prove that $(n-1)! \equiv -1 \pmod{n}$ iff $n$ is prime
added 97 characters in body
Jul
21
answered Prove that $(n-1)! \equiv -1 \pmod{n}$ iff $n$ is prime
Jul
21
comment What is an inner product space?
How do you get an inner product from a symmetric, positive definite matrix? I think I've heard this before.
Jul
21
answered List of Interesting Math Blogs
Jul
21
comment Does .99999… = 1?
Reopened -d this is a valid question
Jul
21
answered Is there a real number lookup algorithm or service?
Jul
21
comment Euclidean Tilings that are Uniform but not Vertex-Transitive
Could you clarify vertix-transitive a bit more?
Jul
21
comment How do you determine if a point sits inside a polygon?
Lolz, I just realised that when I originally stuffed up the corner cases, I actually stuffed up corner cases
Jul
21
awarded  Student
Jul
21
comment Are the “proofs by contradiction” weaker than other proofs?
@Noah: Not really - I don't think Scott's statement is very accurate. The nicer proof is extremely context dependant
Jul
21
answered Are the “proofs by contradiction” weaker than other proofs?
Jul
21
revised Card doubling paradox
deleted 11 characters in body
Jul
21
comment Card doubling paradox
@Ami: I wasn't very clear before. I think that it may be clearer now.
Jul
21
revised Card doubling paradox
added 96 characters in body; added 119 characters in body; deleted 2 characters in body
Jul
21
comment How do you determine if a point sits inside a polygon?
Wikipedia article
Jul
21
revised How do you determine if a point sits inside a polygon?
added 523 characters in body; added 9 characters in body
Jul
21
awarded  Teacher