Jisho

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(数学)
Wikipedia definition
1. AlmostIn set theory, when dealing with sets of infinite size, the term almost or nearly is used to mean all the elements except for finitely many. In other words, an infinite set S that is a subset of another infinite set L, is almost L if the subtracted set L\\S is of finite size. Examples: The set is almost N for any k in N, because only finitely many natural numbers are less than k.
Read “Almost” on English Wikipedia
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