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arXiv · 2606.20358

Formalizing Extended Complex Numbers, Mobius Transformations, and Cross Ratio in Lean 4

Fubin Yan·Kenneth W. Shum
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Abstract

The extended complex plane is a fundamental object in complex analysis, hyperbolic geometry, and mathematical physics. Its geometry is governed by M\"obius transformations, with the cross ratio serving as a central invariant. We present a formalization of these concepts in the Lean4 theorem prover. The extended complex plane is represented using Mathlib's Option type over $\mathbb{C}$, where the additional element represents the point at infinity. On this foundation, we define M\"obius transformations, their action on the extended complex plane, and the cross ratio. We formalize several basic properties of M\"obius transformations, including their group structure, and identify them with a projective general linear group. We also prove the uniqueness of a M\"obius transformation mapping any three distinct points to any other three distinct points, and the invariance of the cross ratio. All proofs are machine-checked in Lean 4. The complete development comprises approximately 6,000 lines of Lean code, including about 40 definitions and 150 lemmas and theorems. This work provides a verified foundation for future formalizations of conformal geometry, hyperbolic models, modular forms, and applications in mathematical physics.

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Fubin Yan, Kenneth W. Shum. 2026-06-18. Formalizing Extended Complex Numbers, Mobius Transformations, and Cross Ratio in Lean 4. https://arxiv.org/abs/2606.20358

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