The connectivity between nodes in any undirected graph is (equivalence relation).
The bound range of quantifiers is called the scope of quantifiers.
N is natural number set, and ≤ is less than or equal to the relation, then (n, ≤) is (distributive lattice? )
The meaning of a set, b, c, the following statement is correct (? )
5. Suppose there are four elements in the set A, then the number of different equivalence relations on A is (? 15).
6. Answer: reflexivity, antisymmetry and transitivity.
7.？ In algebraic system, the relationship between the whole ring and the domain is (the domain must be the whole ring).
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