3,966 reputation
22056
bio website google.com/profiles/walkraft
location Sydney, Australia
age 27
visits member for 4 years, 3 months
seen Aug 31 at 13:52
  • Bachelor of Science (Adv Maths) with Honors in Computer Science from USYD
  • Programming C/C++/Java/Python/Objective C/C#/Javascript/PHP

Jul
21
awarded  Mortarboard
Jul
21
comment What are all the homomorphisms between the rings $\mathbb{Z}_{18}$ and $\mathbb{Z}_{15}$?
Okay, so the annihilation leads to the mapping being a homomorphism as both rings are cyclic.
Jul
21
awarded  Scholar
Jul
21
accepted Unital homomorphism
Jul
21
revised Prove that $(n-1)! \equiv -1 \pmod{n}$ iff $n$ is prime
added 51 characters in body
Jul
21
comment Prove that $(n-1)! \equiv -1 \pmod{n}$ iff $n$ is prime
For 2., it is vital that the inverse is unique. Otherwise, this is a very nice summary
Jul
21
comment Do complex numbers really exist?
@Niel: I think the question is good, it is just that your title doesn't reflect this
Jul
21
comment What are all the homomorphisms between the rings $\mathbb{Z}_{18}$ and $\mathbb{Z}_{15}$?
What do you mean by $T \subset Z_{10}$? In fact, what do you mean by $T$?
Jul
21
asked Unital homomorphism
Jul
21
answered What are all the homomorphisms between the rings $\mathbb{Z}_{18}$ and $\mathbb{Z}_{15}$?
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 Is $.999999999… = 1$?
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?