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Additional
non-empty set
English Wikipedia - The Free Encyclopedia
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Empty set
In
mathematics
, and more specifically
set theory
, the
empty set
is the unique
set
having no
elements
; its size or
cardinality
(count of elements in a set) is
zero
. Some
axiomatic set theories
ensure that the empty set exists by including an
axiom of empty set
; in other theories, its existence can be deduced. Many possible properties of sets are
trivially
true for the empty set.
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