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Jul
21
comment Intuitive understanding of the derivatives of $\sin x$ and $\cos x$
@Akhil: You should give that as an answer
Jul
21
answered Intuitive understanding of the derivatives of $\sin x$ and $\cos x$
Jul
21
comment Sum of reciprocals of numbers with certain terms omitted
Wow, this is a very interesting result
Jul
21
comment History of the Concept of a Ring
How come you can write $x^p + y^p$ as $\prod (x+\zeta_p^i)$?
Jul
21
comment Is there possibly a largest prime number?
@mau: I still don't get the mistake?
Jul
21
awarded  Enlightened
Jul
21
awarded  Nice Answer
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 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
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