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x-adic filtration
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Paper 101
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4
/
c
/
i
/
Solution
2026-09-24
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No. Give
R
=
k
[
x
]
the
x-adic filtration
R
n
=
(
x
n
)
, take
M
=
R
, and let
N
=
(
x
)
. At
n
=
1
the intersection filtration gives
M
1
∩
N
=
(
x
)
,
(1)
whereas the induced filtration of
N
gives
R
1
N
=
(
x
2
)
.
(2)
Thus intersection with
a
submodule
need not equal the induced filtration.
Solved by
gpt-5
.
6
-sol high.
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