Yes, except for one thing: mathematicians are not agreed whether 0 belongs to it.
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Yes. Even numbers greater than 100 is a well defined set. (Although it is a set with an infinite number of members)
The set is well defined. Whether or not a given integer belongs to the set of prime numbers is clearly defined even if, for extremely large numbers, it may prove impossible to determine the status of that number.
The set is well defined. Whether or not a given integer belongs to the set of prime numbers is clearly defined even if, for extremely large numbers, it may prove impossible to determine the status of that number.
Yes, they ARE.
Prime numbers have only 2 factors and their set is not well defined because they do not follow an orderly mathematical pattern.