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Another note on closed n-cells in \(R^ n\). (English) Zbl 0518.57011
MSC:
57N50 \(S^{n-1}\subset E^n\), Schoenflies problem
54C55 Absolute neighborhood extensor, absolute extensor, absolute neighborhood retract (ANR), absolute retract spaces (general properties)
55S35 Obstruction theory in algebraic topology
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