David Lewis

Member for 13 years, 4 months
Last seen more than a month ago

Boston, MA, US

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Taking Seats on a Plane

Oct 1, 2010

A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language

Jul 27, 2010

A challenge by R. P. Feynman: give counter-intuitive theorems that can be translated into everyday language

Sep 18, 2010

Intuitive understanding of the derivatives of $\sin x$ and $\cos x$

Jul 28, 2010

Derivation of the formula for the vertex of a parabola

Aug 6, 2010

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Why eliminate radicals in the denominator? [rationalizing the denominator]

Mar 9, 2011

Eilenberg's rational hierarchy of nonrational automata & languages

Feb 2, 2012

Both solutions to a quadratic make sense -- looking for applications

Mar 14, 2011

Law of cosines with impossible triangles

Jul 27, 2010

Name that curve!

Jun 10, 2012

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