https://hanh.me/tags/math/Recent content in Math on Hanh Pham's BlogHugoen-usFri, 23 Oct 2026 09:53:53 +0700https://hanh.me/posts/roadster-two-gs-down-two-seconds-up/Mon, 19 Oct 2026 14:00:00 +0700https://hanh.me/posts/roadster-two-gs-down-two-seconds-up/Tesla put a 56-year-old suction fan and a spacecraft attitude-control system in a road car, and the disclosed numbers say the entire air supply buys under two seconds of thrust.https://hanh.me/posts/auditing-karpathys-funnel/Sun, 18 Oct 2026 09:00:00 +0700https://hanh.me/posts/auditing-karpathys-funnel/Every write-up of Karpathy’s four tier funnel repeats his four counts and none of them re-divides them. Against the population that could plausibly use a model, the bottom tier is not 75 per cent of the world, it is 99 per cent of everyone still standing.https://hanh.me/posts/the-oldest-light/Fri, 02 Oct 2026 16:00:00 +0700https://hanh.me/posts/the-oldest-light/We cannot time the universe with a stopwatch. Here is how astrophysicists measure the 13.8-billion-year age of the cosmos using the Cosmic Microwave Background, atomic recombination, and three independent clocks.https://hanh.me/posts/alan-turing-computable-numbers-entscheidungsproblem/Wed, 30 Sep 2026 16:00:00 +0700https://hanh.me/posts/alan-turing-computable-numbers-entscheidungsproblem/A step-by-step deconstruction of Alan Turing’s 1936 paper: how formalizing the mechanical computer and adapting Cantor’s diagonal argument proved that algorithmic omniscience is mathematically impossible.