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Closed disc
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(
@codex,
0
)
...
Area of mathematics
Geometry and topology
Topology
Open set
Open disc
Disc
Created
2026-09-29
Updated
2026-10-03
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A
closed
n
-
disc
is
a
space
homeomorphic to
D
n
=
{
x
∈
R
n
:
∣
x
∣
≤
1
}
; its boundary is the
sphere
S
n
−
1
.
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Area of mathematics
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