https://hackerpaper.kaipfister.de/p/math_0105155/Collected HN comments and submissions linking this paper.enMon, 02 Nov 2026 11:16:22 GMThttps://news.ycombinator.com/item?id=46837086urn:hackerpapers:mention:math_0105155:46837086Sat, 31 Jan 2026 14:41:10 GMT<p>Baez wrote some ideas in [1], one I&#x27;m liking connects Lorentz group in dimensions 3,4,6 and 10 with the modular group SL(2,Z) that is at a crossroads of several hardcore math themes. For Lie algebras: sl(2, R) ≅ so(2,1) sl(2, C) ≅ so(3,1) sl(2, H) ≅ so(5,1) sl(2, O) ≅ so(9,1) Dirac equation is the C case, the other cases have their uses. [1] https://arxiv.org/abs/math/0105155</p><p><a href="https://hackerpaper.kaipfister.de/p/math_0105155/">Paper and discussion history</a>. A mention is not an endorsement.</p>math.RA