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Finite-index subgroup
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Mathematics
Area of mathematics
Algebra
Group theory
Group
Subgroup
2026-09-28
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A
subgroup
H
≤
G
has finite index when the
coset
space
G
/
H
is finite. Intersecting
a
finite-index
subgroup
with
a
subgroup
again gives
a
finite-index
subgroup
of the latter.
Ancestors
(7)
Subgroup
Group
Group theory
Algebra
Area of mathematics
Mathematics
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Finite-index invariance of Poincare duality for torsion-free groups
Modular form on a finite-index subgroup
Orbifold fundamental group
Past exam of the mathematics course of the University of Cambridge
/
2003
/
iii
/
Paper 28
/
2
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2003
/
iii
/
Paper 28
/
3
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2014
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iii
/
Paper 4
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2
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ii
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Solution
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2014
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iii
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Paper 4
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2
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Past exam of the mathematics course of the University of Cambridge
/
2017
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iii
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Paper 137
/
4
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2017
/
iii
/
Paper 137
/
5
/
b
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2019
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iii
/
Paper 143
/
1
/
b
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Solution
Past exam of the mathematics course of the University of Cambridge
/
2019
/
iii
/
Paper 143
/
2
/
c
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2023
/
iii
/
Paper 133
/
2
/
c
/
Solution
Quasi-isometry criterion for a group homomorphism
Rational conjugation of finite-index modular subgroups
Row Hermite normal form in rank two
Virtually abelian groups are amenable
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