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fixed points of permutations
(
thing
)
by
ariels
Wed Aug 30 2000 at 10:49:40
There are
n
!
permutation
s on
n
element
s.
The number of "
derangement
s" (permutations with no
fixed point
s) is the closest
integer
to
n
!/
e
; see
counting derangements
.
If we select a permutation uniformly at
random
,
the average number of fixed points of a permutation is 1
.
printable version
chaos
the average number of fixed points of a permutation is 1
derangement
Who shall we eat?
fixed point
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