A clean counterexample shows a map can be locally diffeomorphic yet globally fold
Algomancer · x · 2026-07-21
The post points to a mathematically clean counterexample: a map can be locally a diffeomorphism, preserve infinitesimal volume and orientation, yet still fold globally.
The author suggests it is a useful setting for studying how complex dynamics can acquire global branching, and notes that it likely matters for practical applications that rely on the map being falsified.
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