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Questions and Answers
Which set is often denoted by the boldface Z or blackboard bold Z?
Which set is often denoted by the boldface Z or blackboard bold Z?
What is the smallest group and the smallest ring containing the natural numbers?
What is the smallest group and the smallest ring containing the natural numbers?
Which set is countably infinite?
Which set is countably infinite?
Which numbers are the additive inverses of the corresponding positive numbers?
Which numbers are the additive inverses of the corresponding positive numbers?
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Which set is a subset of the set of all rational numbers?
Which set is a subset of the set of all rational numbers?
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