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Hall-Petrescu formula
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Area of mathematics
Algebra
Group theory
Group
Group operation
Group commutator
2026-10-03
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The Hall-Petrescu
formula
expands
(
x
y
)
p
n
as
x
p
n
y
p
n
times
ordered
powers
of higher
commutators
. In
a
p
-valued
group
, the correction terms have controlled higher
valuation
and make the
p
-
power
map
linear on the associated graded
group
.
Ancestors
(8)
Group commutator
Group operation
Group
Group theory
Algebra
Area of mathematics
Mathematics
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(1)
Past exam of the mathematics course of the University of Cambridge
/
2019
/
iii
/
Paper 145
/
2
/
Solution
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