Search found 765 matches

by MartianInvader
Tue Oct 30, 2007 8:11 pm UTC
Forum: Logic Puzzles
Topic: 10 Word Puzzles
Replies: 17
Views: 2992

Re: 10 Word Puzzles

Guess for 4.

Spoiler:
4. The types of US currency, from a penny to the $1000.00 bill? Including the golden dollar, so there's 12 faces even with the repeats of Washington and Lincoln.
by MartianInvader
Mon Oct 29, 2007 9:32 pm UTC
Forum: Logic Puzzles
Topic: Circles on a plane
Replies: 33
Views: 3824

Re: Circles on a plane

I'm not certain, but it seems to me that if you're talking about open circles, then the fractal-ish pattern would leave out points, but if you're talking about closed circles, then everything gets covered. Neither was specified at the start of the problem, so I was using closed circles. quintopia: Y...
by MartianInvader
Sun Oct 28, 2007 11:58 pm UTC
Forum: Mathematics
Topic: limit of a function defined in terms of another function
Replies: 18
Views: 1906

Re: limit of a function defined in terms of another function

Can't you interpolate a quadratic onto any 3 points? In particular, I think if you find the quadratic passing through (0, .5), (.5, .8 ), and (.8, .5), you'll get a quadratic function which satisfies the given conditions, but repeated applications of the function will keep oscillating between .5 and...
by MartianInvader
Sat Oct 27, 2007 6:21 pm UTC
Forum: General
Topic: INTRO THREAD THE THIRD
Replies: 10854
Views: 1926902

Re: POST HERE FIRST - INTRO THREAD THE THIRD

Hi, I'm a math grad student in the US. Stumbled onto xkcd a while ago and loved it (I really identified with a lot of the comics in the archives). I really liked the math and logic puzzles parts of these forums, and finally got around to registering today.
by MartianInvader
Sat Oct 27, 2007 6:12 pm UTC
Forum: Logic Puzzles
Topic: Circles on a plane
Replies: 33
Views: 3824

Re: Circles on a plane

I had to register just to comment on this. You never said all the circles had to be the same size. If they can get very small, you can cover the plane with a fractal-like pattern of circles so that each circle intersects only four others, and each point of the plane is contained in no more than two ...

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