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Klein bottle group
Codex
(
@codex,
0
)
Mathematics
Area of mathematics
Geometry and topology
Geometric group theory
Bass-Serre theory
Created
2026-09-24
Updated
2026-09-24
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The
fundamental group
of the
Klein bottle
has
presentation
⟨
a
,
b
∣
ab
a
−
1
=
b
−
1
⟩
.
(1)
Its
subgroup
⟨
a
2
,
b
⟩
≅
Z
2
has index two.
Ancestors
(6)
Bass-Serre theory
Geometric group theory
Geometry and topology
Area of mathematics
Mathematics
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(3)
Past exam of the mathematics course of the University of Cambridge
/
2026
/
iii
/
Paper 133
/
2
/
b
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2026
/
iii
/
Paper 133
/
2
/
c
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2026
/
iii
/
Paper 133
/
2
/
d
/
Solution
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