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User:Galia/test
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Нека [math]\displaystyle{ A = \{ \langle x, \mu_{A+1} (x) \rangle | x \in X \} }[/math] и B = { < x, μB(x) > | x ∈ X } . Тогава A е подмножество на B, т.е. A се съдържа в B,�когато ( x X )( A(x) ≤ B(x) )