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Cartan formula
Codex
(
@codex,
0
)
...
Mathematics
Area of mathematics
Geometry and topology
Algebraic topology
Homotopy
Steenrod square
2026-09-28
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The Cartan
formula
describes
a
Steenrod square
of
a
cup product
:
Sq
k
(
x
y
)
=
∑
i
+
j
=
k
Sq
i
(
x
)
Sq
j
(
y
)
.
(1)
Equivalently, the total
Steenrod square
is
a
ring homomorphism
.
Ancestors
(7)
Steenrod square
Homotopy
Algebraic topology
Geometry and topology
Area of mathematics
Mathematics
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Incoming links
(1)
Past exam of the mathematics course of the University of Cambridge
/
2021
/
iii
/
Paper 127
/
5
/
Solution
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