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visits member for 4 years, 2 months
seen Oct 18 at 2:47

Don't have much time these days...


Sep
7
answered Beautiful identity: $\sum_{k=m}^n (-1)^{k-m} \binom{k}{m} \binom{n}{k} = \delta_{mn}$
Sep
6
comment Find polynomials such that $(x-16)p(2x)=16(x-1)p(x)$
@bill: Thanks. +1.
Sep
6
accepted Irrational painting device
Sep
6
comment Find polynomials such that $(x-16)p(2x)=16(x-1)p(x)$
btw, Thank you for taking the time to write this out! Sorry for the possibly basic question.
Sep
6
awarded  Enlightened
Sep
6
comment Find polynomials such that $(x-16)p(2x)=16(x-1)p(x)$
How do you get $(S-1)f = (S^4-1)g$? What does $S-1$ even mean?
Sep
6
awarded  Nice Answer
Sep
6
awarded  Nice Question
Sep
6
revised finding seven disjoint seven element subsets of {1,2, …, 49} with same sum
edited title, formatting.
Sep
6
answered finding seven disjoint seven element subsets of {1,2, …, 49} with same sum
Sep
6
comment $5^n+n$ is never prime?
Nice! Please do update us if you do let Primo finish.
Sep
6
comment Cutting sticks puzzle
Yes, this is incorrect. You might glue it, but you have not ensured that the resulting split happens at the spot where you glued.
Sep
6
comment If $(a^{n}+n ) \mid (b^{n}+n)$ for all $n$, then $ a=b$
@Jason: math.stackexchange.com/questions/4125/5nn-is-never-prime
Sep
6
asked $5^n+n$ is never prime?
Sep
5
comment How do I calculate a specific variation for a known value of the normal distribution function?
+1. I suggest you add a brief explanation of the Lambert function. I will delete my answer.
Sep
5
comment How do you show that $l_p \subset l_q$ for $p \leq q$?
Is this homework?
Sep
5
answered Finding a clever solution to a game of chance
Sep
4
comment Sum of divisors and prime numbers, short proof
$\sigma$ is sum of divisors I presume? Also, this sounds like homework. Is it?
Sep
4
revised Sum of divisors and prime numbers, short proof
fix up formatting.; added 3 characters in body
Sep
4
comment How do I calculate a specific variation for a known value of the normal distribution function?
I have tried to convert to latex (which you can do by enclosing in $ signs), so if things aren't what you expect, let me know.