431 reputation
1618
bio website ozemail.com.au/~markhurd
location Cherry Gardens, Australia
age 45
visits member for 4 years, 3 months
seen 4 hours ago

I have a background in VB and C and an Honours degree in Mathematical Sciences from Adelaide University, majoring in Computer Science.

I have over 15 years VB experience and have dealt with back-end details, including without using databases.


Nov
18
comment How many $\mathbb R$s must a Mathematician walk down?
I haven't confirmed the details but isn't this the solution: Step 1 needs to be a walk in any direction long enough to avoid rounding errors. Step 2 can then be towards one of the possible origins determined by the triangle implied by the two lengths towards it we now have. Step 3 (if needed) is to turn around and walk toward the correct origin if the wrong one was chosen before. (And you now have three lengths pointing to it.)
Oct
28
comment Ratio of product from one point and minimum distance
The simple answer is $1$ (unless any two of the points are coincident, in which case the $m=0$ and the ratio does not exist) but I can see there's probably a better solution because for $n>6,m$ is likely $<|A_0A_k|$.
Oct
20
revised How to prove that $\frac{(5m)!(5n)!}{(m!)(n!)(3m+n)!(3n+m)!}$ is a natural number?
Slightly further...
Sep
30
comment Why is Banach–Tarski's paradox so interesting?
If you mapped only the irrationals $x\in[0,1]\to x+1$, under certain measures you'd have a mapping from $[0,1] \to [0,2)$, at least, but that's definitely not a finite number of sets.
Sep
14
awarded  Electorate
Sep
14
revised Is “$a + 0i$” in every way equal to just “$a$”?
Someone would have pointed it out by now
Sep
9
answered How to read this in English?
Sep
2
comment Does the string of prime numbers contain all natural numbers?
@tohecz Yes, it actually means there's no need to string the primes together, simply $2,3,5, \dots$ will contain all natural numbers somewhere.
Sep
1
revised What is mathematical basis for the percent symbol (%)?
deadlink recovered from wayback
Sep
1
suggested suggested edit on What is mathematical basis for the percent symbol (%)?
Aug
12
answered Is “$a + 0i$” in every way equal to just “$a$”?
Aug
6
comment Relate $\sum{a_n}$ and $\sum{n a_n}$
I asked because I noticed that $\zeta(3)=\sum{1/n^3}=$[Apéry's constant](en.wikipedia.org/wiki/Apery%27s_constant) and $\zeta(2)=\sum{1/n^2}=\sum{n/n^3}=\frac{\pi^2}{6}$. Given the answer here I asked another question.
Aug
6
accepted Relate $\sum{a_n}$ and $\sum{n a_n}$
Aug
6
accepted What's $\sum{\frac{x^n}{n^3}}$?
Aug
6
asked What's $\sum{\frac{x^n}{n^3}}$?
Aug
6
asked Relate $\sum{a_n}$ and $\sum{n a_n}$
Jul
11
comment Why isn't the Cantor Set contradictory?
Your last paragraph took a moment: until you realize there's actually an infinite number between in both cases, and still countable or not, respectively.
Jul
11
revised What does a “convention” mean in mathematics?
Promote my comment to be part of the answer, because of changes to the Wikipedia link.
Jun
25
comment How big is infinity?
Yes, except for the mapping s typo.
Jun
21
comment Proof that there are infinitely many primes of the form $4m+3$
To be a valid proof of the requested theorem, the first line should be "Assume there are finitely many primes of the form $4m+3$, and take $p_k$ to be the largest."