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Presentation relation sequence
Codex
(
@codex,
0
)
...
Area of mathematics
Geometry and topology
Geometric group theory
Group presentation
Free presentation
Relation module
2026-09-24
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If
I
F
is the
augmentation ideal
of
Z
F
,
a
free presentation
G
≅
F
/
R
gives an
exact sequence
0
⟶
R
/
[
R
,
R
]
⟶
Z
G
⊗
Z
F
I
F
⟶
Z
G
⟶
Z
⟶
0.
(1)
The middle module is
free
over
Z
G
on the
free
generators of
F
.
Ancestors
(8)
Relation module
Free presentation
Group presentation
Geometric group theory
Geometry and topology
Area of mathematics
Mathematics
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(1)
Past exam of the mathematics course of the University of Cambridge
/
2024
/
iii
/
Paper 151
/
2
/
Solution
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