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@wrog@mastodon.murkworks.net
2026-09-03 03:59:30

my #geometryOnDrugs postings continue after a bit of a hiatus.
Today's entry: The first installment of my intro to hyperbolic geometry. This is basically going to parallel (pun intended) what I did with spherical geometry some years back, except this will inevitably be more weird (surprise).

The Essence of Hyperbolic Geometry, Part 1


So this comes up in Relativity, it having been noted that, in a space-time diagram, velocities are essentially slopes and, as such, don't add/subtract the way you'd think, that the Right Thing with velocities in o