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Sep
14
comment Why is $e^{\pi \sqrt{163}}$ almost an integer?
accepted as answer for explaining how some numbers approach integers, albeit with a completely different example. I understand Rumanujan's Constant is way beyond my understanding of mathematics.
Sep
14
accepted Why is $e^{\pi \sqrt{163}}$ almost an integer?
Sep
13
comment How do I map a spherical triangle to a plane triangle?
Maybe also interesting for gis.stackexchange.com?
Sep
13
asked Why is $e^{\pi \sqrt{163}}$ almost an integer?
Sep
13
revised sangaku - a geometrical puzzle
deleted 59 characters in body
Sep
13
comment sangaku - a geometrical puzzle
This is the approach I followed too, but I had some trouble finding a second equation to get rid of the theta :-(
Sep
13
comment sangaku - a geometrical puzzle
accepted as answer for indeed looking nicer than your other solution.
Sep
13
accepted sangaku - a geometrical puzzle
Sep
12
revised sangaku - a geometrical puzzle
edited title; added 15 characters in body
Sep
12
revised sangaku - a geometrical puzzle
added 79 characters in body
Sep
12
asked sangaku - a geometrical puzzle
Sep
12
revised Boy Born on a Tuesday - is it just a language trick?
added 12 characters in body
Sep
12
comment Boy Born on a Tuesday - is it just a language trick?
@muad: there doesn't seem a mistake in your derivation; the error was in my intuition that the day couldn't possibly have anything to do with it.
Sep
12
revised Boy Born on a Tuesday - is it just a language trick?
added 209 characters in body
Sep
11
comment Do complex numbers really exist?
"When you first hear this, it sounds crazy." I must say, when I first saw it being drawn in the Argand plane, it made perfectly sense to me: you introduce an imaginary axis because your imaginary number obviously can fit nowhere on the real axis. If you say i = 1 rotated CW over 90°, then i*i = 1 rotated over 2*90°, and you've arrived at -1, back on the real axis! The Argand plane made it all clear to me. Unfortunately I have no such representation for quaternions :-(
Sep
11
answered Do complex numbers really exist?
Sep
11
comment Liouville's number revisited
I guess I should have said "Liouville's constant" instead of "Liouville's number".
Sep
11
revised Boy Born on a Tuesday - is it just a language trick?
added 154 characters in body
Sep
11
answered Boy Born on a Tuesday - is it just a language trick?
Sep
8
comment We can divide $7^{17} - 7^{15}$ by?
I hope this was a multiple choice question, because 6 is not the only answer. There's 1, 2, 3, 4, 6, 7, 8, 12, etcetera. 160 divisors in all :-)