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==Mathematical Definition==
==Mathematical Definition==
Let A and B be sets. A is a subset of B if and only if every element of A is also an element of B.
Let A and B be sets. A is a subset of B if and only if every element of A is also an element of B.
A⊆B <=> (∀)(x∈A => x∈B}
[[Category:Mathematics]]
[[Category:Mathematics]]