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Self-intersection formula
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Mathematics
Area of mathematics
Geometry and topology
Algebraic geometry
Intersection theory
Normal bundle
Created
2026-09-24
Updated
2026-09-24
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For
a
regular closed
embedding
i
:
X
↪
Y
of
codimension
d
, the
self-intersection formula
is
i
∗
i
∗
(
α
)
=
c
d
(
N
X
/
Y
)
∩
α
.
Ancestors
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Normal bundle
Intersection theory
Algebraic geometry
Geometry and topology
Area of mathematics
Mathematics
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(1)
Past exam of the mathematics course of the University of Cambridge
/
2025
/
iii
/
Paper 162
/
3
/
iv
/
Solution
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