автордың кітабынан сөз тіркестері Discrete Math. For students of technical specialties
Ivan Treshchev

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Sets are called equipotent if their powers coincide.

— The sets A and B are considered equal if: A⊂B, B⊂A.

— The sets A and B are considered equal if they consist of the same elements, then they write: A = B and A ≠ B — otherwise.

The set U is called universal, that is, all the sets under consideration are its subset.

A set containing no elements is called empty, denoted as: ∅. It is a subset of any set.

For arbitrary sets X, Y, Z the following relations are true: — X⊆X; — if X⊆Y, Y⊆Z, then X⊆Z; — if X⊆Y, Y⊆X, then X = Y.

автордың кітабынан сөз тіркестері Discrete Math. For students of technical specialtiesIvan Treshchev