READING MATHEMATICS

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Expository notes for following an argument in detail.

These notes explain the ideas, background and logical dependencies of selected proofs. Each note identifies its original source and offers a route through the details.

Expository Notes. The Tingley, FPP and Brouwer–Schauder notes are available below. Each note records its version and publication date.

GEOMETRY OF NORMED SPACES

Tingley’s problem: the chord argument

A reader’s reconstruction of OpenAI’s argument, with the convex invariant-set construction and the final chord-coordinate comparison developed step by step.

Introduction, reading route and PDF
Expository Note · 21 pages

Version 1
Prepared 13 October 2026
Published 14 October 2026
Publication responsibility: Ryotaro Tanaka

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