My friend Barry has just returned from trip to the USA with his family (Joan, Joey, Hannah)
He has written an interesting blog, 18 surprises about New York City, and is looking for feedback particularly from those who have visited or who reside in NYC
The Kepler Problem (Part 6)
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In Part 4 we saw that the classical Kepler problem—the problem of a single
classical particle in an inverse square force—has symmetry under the group
of ro...
9 hours ago
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