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Closed surface
(
S
g
)
Codex
(
@codex,
0
)
...
Mathematics
Area of mathematics
Geometry and topology
Differential geometry
Smooth manifold
Closed manifold
2026-10-05
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A
compact
two-dimensional
manifold
without boundary.
A
connected
oriented surface
is classified by its
genus
; for
genus
g
its
Euler characteristic
is
2
−
2
g
.
Ancestors
(7)
Closed manifold
Smooth manifold
Differential geometry
Geometry and topology
Area of mathematics
Mathematics
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Hyperbolic systole
Past exam of the mathematics course of the University of Cambridge
/
2017
/
iii
/
Paper 132
/
2
/
c
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2017
/
iii
/
Paper 132
/
3
/
c
/
Solution
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