2. infinite sets (Infinite Set)
infinite sets (Infinite Set) is a set number of members who can not tell because there are many members, such as A = {1, 2, 3, ...} can be seen that a set A can not tell you the number. Members last in this set have been exhausted, so set A is infinite sets Let's see another example, I B = {3, 5, 7, ...} can be seen that set B can not tell you the number of members is an odd number. B is set out so infinite sets.
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