Search found 56 matches

by Timefly
Thu Aug 25, 2011 9:36 pm UTC
Forum: Serious Business
Topic: Secrets
Replies: 46
Views: 6835

Re: Secrets

Has anyone seen "The Invention of Lying"?

It's rather interesting.
by Timefly
Mon Aug 08, 2011 2:08 pm UTC
Forum: Mathematics
Topic: New Scientist Enigma 1658
Replies: 8
Views: 1839

Re: New Scientist Enigma 1658

Got an answer of
Spoiler:
983720
.
by Timefly
Mon Aug 08, 2011 8:23 am UTC
Forum: Mathematics
Topic: New Scientist Enigma 1658
Replies: 8
Views: 1839

Re: New Scientist Enigma 1658

You are not following the rules.]


Oh yeah, woops, well that's a start and thanks for the rest guys, I'll have a go at this later and see how it works out.
by Timefly
Sun Aug 07, 2011 11:46 pm UTC
Forum: Mathematics
Topic: New Scientist Enigma 1658
Replies: 8
Views: 1839

New Scientist Enigma 1658

New Scientist Magazine in the UK poses a maths problem once a week called Enigma and I enjoy these, but I've come across one particularly hard one and I was wondering if someone could point me in the right direction as I'm stuck. The problem is as follows: ENIGMA is a number in which the letters den...
by Timefly
Thu Aug 04, 2011 8:45 pm UTC
Forum: Mathematics
Topic: Whole Number Solutions
Replies: 6
Views: 1249

Re: Whole Number Solutions

Thanks for that Qaanol, that's dead useful.
by Timefly
Thu Aug 04, 2011 6:19 pm UTC
Forum: Mathematics
Topic: Whole Number Solutions
Replies: 6
Views: 1249

Whole Number Solutions

Question, are there any whole number solutions to the equation pi(2x) - pi(x) = 0 when x > 2 ?
by Timefly
Thu Jul 28, 2011 10:27 am UTC
Forum: Mathematics
Topic: Prime Factorisation Running Time
Replies: 3
Views: 980

Prime Factorisation Running Time

Just a quick question, I've been reading up on prime factorization and I'm not sure what the running time of the following algorithm is. It seems polynomial to me but obviously it's not. Could someone run me through what the running time is and why that would be fab. Thanks. :) STEP 1: Input x STEP ...
by Timefly
Wed Jul 20, 2011 11:09 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0927: "Standards"
Replies: 157
Views: 34683

Re: 0927: "Standards"

I invoke induction.
by Timefly
Mon Apr 04, 2011 9:35 pm UTC
Forum: Individual XKCD Comic Threads
Topic: 0881: "Probability"
Replies: 326
Views: 105986

Re: 0881: "Probability"

On xkcd Randall is God. It's his strip, his life, his art. I just wish assholes would remember that and leave it alone. Everyone needs some support sometimes, or to just get some emotion out to people they call friends, which in this case seems to be the xkcd community. I love that Randall is so ope...
by Timefly
Mon Mar 28, 2011 3:52 pm UTC
Forum: Mathematics
Topic: The 6 in Spearman's Rank
Replies: 2
Views: 2065

The 6 in Spearman's Rank

Why is there a 6 in Spearman's rank?
Seriously, why the 6?
by Timefly
Tue Dec 28, 2010 12:21 pm UTC
Forum: Mathematics
Topic: Cardinalities
Replies: 15
Views: 1852

Re: Cardinalities

Cheers, one quick second question. How can it be 2^aleph-null when if you think of binary integers there are aleph-null places that can be filled yet the number of integers is not 2^aleph-null?
by Timefly
Tue Dec 28, 2010 9:59 am UTC
Forum: Mathematics
Topic: Cardinalities
Replies: 15
Views: 1852

Re: Cardinalities

Sorry, I worded this badly, let me try again. The function: f(x) = x/(10^ceil(log10(x))) returns a real number number between 0 and 1. z = f(x) A is the set of all possible values of z where x is a positive integer. This has a one to one correspondence with the set of all integers meaning it has a c...
by Timefly
Mon Dec 27, 2010 7:50 pm UTC
Forum: Mathematics
Topic: Cardinalities
Replies: 15
Views: 1852

Re: Cardinalities

B has a cardinality of aleph null.
A is a member of set B.

It's not homework, it's just a badly developed train of thought.
by Timefly
Mon Dec 27, 2010 6:28 pm UTC
Forum: Mathematics
Topic: Cardinalities
Replies: 15
Views: 1852

Cardinalities

f(x,y) = y + x/(10^ceil(log10(x)))
Where x and y are integers.

A is the set of all solutions of f(x,2).
A has cardinality Aleph null.

B is the set of all the sets of solutions to f(x,z) where z is an integer.
C is the set of all the members of all subsets of B.

What's the cardinality of C?
by Timefly
Sat Dec 04, 2010 10:35 pm UTC
Forum: Mathematics
Topic: Would this be a proof?
Replies: 14
Views: 1727

Would this be a proof?

I'm still getting used to the idea of proofs and I'm just wondering would this be a proof that there are infinite Pythagorean triples? Consider that the numbers are a Pythagorean triple 3, 4 and 5. When a = 3, b = 4, c = 5 a^2 + b^2 = c^2 as 9 + 16 = 25. x is a positive integer. When x = 1 the formu...
by Timefly
Sun Nov 14, 2010 7:34 pm UTC
Forum: Logic Puzzles
Topic: Oranges
Replies: 3
Views: 1586

Oranges

If all my oranges have oranges how many oranges do I have?

Spoiler:
Assuming I start with an orange and there's no multiple inheritance, infinite. If I start with 0 then I end with 0. If there's multiple inheritance then indeterminate.

Go to advanced search