Mathematics
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David Lewis

Apparently, this user prefers to keep an air of mystery about them.

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  • Boston, MA, US
  • Member for 10 years, 2 months
  • 363 profile views
  • Last seen Jun 21 '19 at 11:14

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20 No radical in the denominator — why? [duplicate] Mar 9 '11
20 Eilenberg's rational hierarchy of nonrational automata & languages Feb 2 '12
20 Taking Seats on a Plane Oct 1 '10
14 A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language Jul 27 '10
13 A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language Sep 18 '10
9 Intuitive understanding of the derivatives of $\sin x$ and $\cos x$ Jul 28 '10
8 How to calculate reflected light angle? Aug 8 '10
7 Derivation of the formula for the vertex of a parabola Aug 6 '10
7 Law of cosines with impossible triangles Jul 27 '10
7 Both solutions to a quadratic make sense — looking for applications Mar 14 '11
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