Metamath Proof Explorer: A Modern Principia Mathematica
Why the open web links it
Explains how Metamath Proof Explorer formalizes mathematics with axioms and precise proofs, akin to Principia Mathematica.
Linked by 4 independent sites, 2 of them widely read in the 2026-10 crawl of the open web, including ycombinator.com, dwheeler.com, metamath.org, allofphysics.com.