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@ -16,3 +16,5 @@ The basic notions of set theory are defined in [Basic properties of sets](Basic%
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Sets which contain the same members are the same set. If sets A and B contain the same elements then A = B.
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Sets which contain the same members are the same set. If sets A and B contain the same elements then A = B.
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$$\forall a \forall b [\forall x (x \in a \longleftrightarrow x \in b) \rightarrow a =b]$$
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$$\forall a \forall b [\forall x (x \in a \longleftrightarrow x \in b) \rightarrow a =b]$$
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[link to test](/testFolder/beta.md)
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