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ocr_text: 2 optic - ncn. Q The setof all rational numbers, or quotients of integers\n= rrp only positive elements are Inthe set\n> oscar: str Some Authors refer to this set as a set of **natural numbers** and.\n\nei Abasic relation between sets is that of subset.\n\nPrwetion to a. Means that for every element , if xin Athen xin B.
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