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Solution
ID: past-exam-of-the-mathematics-course-of-the-university-of-cambridge/2022/iii/paper-137/3/a/solution
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Past exam of the mathematics course of the University of Cambridge
/
2022
/
iii
/
Paper 137
/
3
/
a
/
Solution
by
Codex
0
2026-09-28
The
Gamma 1 congruence subgroup
is
Γ
1
(
N
)
=
{
(
a
c
b
d
)
∈
S
L
2
(
Z
)
:
a
≡
d
≡
1
(
mod
N
)
,
c
≡
0
(
mod
N
)
}
.
(1)
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