Some friends and readers, knowing that I am dealing with terminal cancer, might have been wondering whether I am still around. For sure, this blog will at some point be shuttered when the cancer wins - or thinks it wins. Not that it really does win. Cancer is stupid. When it kills me, it kills itself too. But it is then gone forever: while I await the resurrection at the renewal of all things. It is like a tiny parable of "the death of death in the death of Christ".
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