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Subadditivity of the base-p digit sum
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Mathematics
Area of mathematics
Number theory
P-adic valuation
Base-p digit sum
2026-09-28
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For nonnegative
integers
x
and
y
,
d
p
(
x
+
y
)
≤
d
p
(
x
)
+
d
p
(
y
)
.
(1)
In column
addition
, every carry replaces
p
units in one digit by one unit in the next digit and therefore decreases the
digit sum
by
p
−
1
.
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(6)
Base-p digit sum
P-adic valuation
Number theory
Area of mathematics
Mathematics
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(2)
Past exam of the mathematics course of the University of Cambridge
/
2021
/
iii
/
Paper 160
/
4
/
b
/
Solution
Past exam of the mathematics course of the University of Cambridge
/
2021
/
iii
/
Paper 160
/
4
/
c
/
Solution
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