## Epicycloid -- from Wolfram MathWorld

The path traced out by a point on the edge of a of rolling on the outside of a of . An epicycloid is therefore an with . Epicycloids are given by the

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The path traced out by a point on the edge of a of rolling on the outside of a of . An epicycloid is therefore an with . Epicycloids are given by the

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Step-by-step directions to build and share a simple subitizing (rapid counting) game with Mathematica and Wolfram CDF Player. Download provided.

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There are many unsolved in mathematics. Some prominent outstanding unsolved problems (as well as some which are not necessarily so well known) include

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Weierstrass functions are famous for being continuous everywhere, but differentiable "nowhere". Here is an example of one:

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