Show HN: Bertrand Russell's Principia Mathematica in Lean https://ift.tt/pRDJuZX

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Show HN: Bertrand Russell's Principia Mathematica in Lean This project aims to formalize the first volume of Prof. Bertrand Russell’s Principia Mathematica using the Lean theorem prover. Throughout the formalization, I tried to rigorously follow Prof. Russell’s proof, with no or little added statements from my side, which were only necessary for the formalization but not the logical argument. Should you notice any inaccuracy (even if it does not necessarily falsify the proof), please let me know as I would like to proceed with the same spirit of rigour. Before starting this project, I had already found Prof. Elkind’s formalization of the Principia using Rocq (formerly Coq), which is much mature work than this one. However, I still thought it would be fun to do it using Lean4. https://ift.tt/07byLCI April 26, 2025 at 12:19AM