LiveMath Example
The notation uses PARTIAL differentiation notation, instead of our more familiar d/dx notation. It works just the same.
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Equal areas of a circle gives nice art
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Here's some nice geometry. It's a way to divide a circle into equal areas, using a pair of compasses and a ruler only.
And it's not bad art, either.
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Vectors

There's a lot more to vectors than just forces and velocities.
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Athens
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Greece had a large influence on Western thought and methods of governance. Here's some recollections from my recent visit to Athens.
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The notation uses PARTIAL differentiation notation, instead of our more familiar d/dx notation. It works just the same.
[You need LiveMath Viewer to see this file. Go to Download LiveMath for information.]