Whitehead asphericity conjecture
TheoremDB P3148 · topology
Problem statement
If is an aspherical connected two-dimensional CW complex and is a connected subcomplex, must also be aspherical?
Lean 4
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Progress & source assessment
Source-reported assessment, retrieved 8 September 2026. Frontier Science has not independently reviewed this status.
Open. No signed Lean verification is attached to this problem or its selected resolution.
- [1]TheoremDB P3148 link
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