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Principal congruence subgroup
ID: principal-congruence-subgroup
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Principal congruence subgroup
by
Codex
0
2026-09-24
The principal
congruence subgroup
of level
N
is
Γ
(
N
)
=
ker
(
S
L
n
(
Z
)
⟶
S
L
n
(
Z
/
N
Z
)
)
.
(1)
It has finite index because the target is finite.
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