Search found 15 matches

by cjr
Mon Jun 25, 2007 3:19 pm UTC
Forum: Mathematics
Topic: log and ln
Replies: 48
Views: 9936

Footnote from An Introduction to the Theory of Numbers by Hardy and Wright, page 8:

"log x is, of course, the 'Napierian' logarithm of x, to base e. 'Common' logarithms have no mathematical interest."

So there!
by cjr
Sun May 13, 2007 10:47 am UTC
Forum: Mathematics
Topic: Passionate about a calculator?
Replies: 139
Views: 24521

I have a ti-83+ which I ended up taking to a pub once, I liked it so much :S

Haven't used it since I started university though

EDIT: I've just read that back and it sounds like I went on a date with my calculator...

I just meant I brought it to show other people the, er, programs I had on it
by cjr
Sun May 13, 2007 10:15 am UTC
Forum: Mathematics
Topic: "Merry Xmas Son #1729"
Replies: 9
Views: 4987

Much better than 23 :) I was doing experimental number theory last term, basically just messing about with pseudoprimes on MatLab, and I encountered the fact that 1729 is n-pseudoprime for all primes n. My friend said it was the smallest number to do that. So there's another reason for its awesomeness
by cjr
Fri Apr 06, 2007 10:39 am UTC
Forum: Logic Puzzles
Topic: Lowest price auctions PUZZLE
Replies: 58
Views: 14955

*bows down*
by cjr
Sat Mar 31, 2007 2:59 am UTC
Forum: Logic Puzzles
Topic: Equators
Replies: 77
Views: 17108

You have to give the exact moment in which the equator is crossed, right? That seems to be what the question is asking. So, flushing the toilet over and over again wouldnt work in even the most ideal of circumstances because you dont know what time between flushes you crossed it. And so on. Sorry, I...
by cjr
Tue Mar 27, 2007 11:27 pm UTC
Forum: Logic Puzzles
Topic: A tasty puzzle
Replies: 24
Views: 5874

Clearly he's a spambot owned by an ice cream factory, trying to make us eat ice cream as fast as possible...
by cjr
Fri Mar 23, 2007 1:27 pm UTC
Forum: Logic Puzzles
Topic: Lowest price auctions PUZZLE
Replies: 58
Views: 14955

Hi, Normally these auctions are played with at least 100 people, so draws really don't turn up. With the three-person case, then they are more likely, although it is still up in the end what constitutes a good tie-breaker. Pick something of interest :) Can Nash Equilibria still be realistically foun...
by cjr
Sat Mar 17, 2007 1:22 pm UTC
Forum: Logic Puzzles
Topic: Lowest price auctions PUZZLE
Replies: 58
Views: 14955

Yes, Yakk, and I think your approach so far has been spot on :) I have a great interest in game theory but no-one wants to teach me it (mathematics undergraduate). Can you recommend me a text on it?
by cjr
Sat Mar 17, 2007 2:28 am UTC
Forum: Logic Puzzles
Topic: Lowest price auctions PUZZLE
Replies: 58
Views: 14955

Lowest price auctions PUZZLE

This is a question that has bugged the hell out of me (I don't know the answer but discussed it often at the pub). I'm going to rephrase it in slightly mathematical terms, but there are lots of auctions out there that use this system. If someone knows an answer from a journal or paper on auction the...
by cjr
Sat Mar 17, 2007 2:20 am UTC
Forum: Logic Puzzles
Topic: Solitaire games
Replies: 7
Views: 3280

There is a large amount of symmetry here so it shouldn't be -too- hard to work out the percentage, but very very laborious. If someone can point me in the direction of the optimal strategy of solitaire (I'm sometimes a bit rubbish at it) I could make a start. Another thing. Isn't there an element of...
by cjr
Fri Mar 16, 2007 11:23 am UTC
Forum: Logic Puzzles
Topic: The surprise exam paradox
Replies: 217
Views: 66495

There are other ways to make sure the students can't "logically deduce" the day (are you sure that's the same question?) He can just straight out lie, and do something he didn't say he would do (such as ask everyone to come in on Saturday) Alternatively, he could roll a fair d5 with the we...
by cjr
Wed Feb 21, 2007 12:02 pm UTC
Forum: Logic Puzzles
Topic: You should be able to solve this!
Replies: 37
Views: 15122

Well, from the context I am guessing that he is in the process of solving a system of linear equations and has arrived at that line. Again, in this context, it essentially isn't contradictory that the equation reduces to 0 = 26 - it is a manifestation of the fact that there is no solutions to his sy...
by cjr
Wed Feb 21, 2007 11:36 am UTC
Forum: Logic Puzzles
Topic: A random, random number
Replies: 8
Views: 3497

I think in this case it doesn't matter, but you are very right to be concerned - it often happens that a seemingly innocuous assumption can change the probability. Conditional probability is very counter-intuitive
by cjr
Thu Jan 11, 2007 10:39 am UTC
Forum: General
Topic: Groaners - The new "Nerdy Jokes" thread
Replies: 41
Views: 11213

I made up a Christmas maths joke, but none of my family were impressed :( Probably only UKers will know the product:

Why is a can of Bisto like the derivative function?

It provides an instantaneous gravy-ent
by cjr
Wed Jan 10, 2007 10:28 pm UTC
Forum: General
Topic: INTRODUCTIONS THREAD
Replies: 3985
Views: 696648

Hey everyone o/

I'm 18, male, and a mathematics undergraduate at Warwick.

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