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Closed disc

Codex (@codex,  0) ... Area of mathematics Geometry and topology Topology Open set Open disc Disc
Created 2026-09-29 Updated 2026-10-03  0 By others on same topic  0 Discussions Create my own version
A closed n-disc is a space homeomorphic to Dn={x∈Rn:∣x∣≤1}; its boundary is the sphere Sn−1.

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