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14h
comment Divisibility and GCD proof
See this answer.
Aug
28
awarded  greatest-common-divisor
Aug
26
comment Why does the Fibonacci Series start with 0, 1?
See this answer for more on the number-theoretical viewpoint.
Aug
23
comment Zero divisor in $R[x]$
@user95553 While $\,fg =X^7 - X = 0\,$ as a polynomial function on $\,\Bbb Z_7,\,$ it is not true that $\,X^7-X = 0\,$ as formal polynomials $\in \Bbb Z_7[X].\,$ Formal vs. functional polynomials is discussed in many prior answers, e.g. this one.
Aug
19
revised Why can we use the division algorithm for $x-a$?
added 24 characters in body
Aug
17
awarded  Nice Answer
Aug
9
awarded  Nice Answer
Aug
6
awarded  Good Answer
Aug
4
awarded  Nice Answer
Aug
3
reviewed Leave Open Is this group of matrices a $p$-group?
Jul
31
revised For $n \geq 2$, show that $n \nmid 2^{n}-1$
added 838 characters in body
Jul
27
awarded  Yearling
Jul
23
awarded  Good Answer
Jul
14
comment Proving that for each prime number $p$, the number $\sqrt{p}$ is irrational
The proof is correct. The downvotes are quite puzzling. If you have questions then please feel welcome to ask.
Jul
14
comment Divisibility for 7
@YoTengoUnLCD It is a strong induction with inductive hypothesis: assuming it is true for all polynomials of degree $< n$ we show that it is true for any polynomial of degree $\,n.\ \ $
Jul
12
reviewed Leave Open How to prove that the Fibonacci sequence is periodic mod 5 without using induction?
Jul
12
reviewed Leave Open Prove $\{a(x,y,z)=(ax,y,z)\}$ is a vector space
Jul
12
reviewed Leave Open How can point group symmetry operations be used to reduce the number of independent crystal properties?
Jul
12
reviewed Leave Open Product of all elements in finite group
Jul
12
reviewed Leave Open Any epi with codomain $P$ is split implies $P$ is projective