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almost all
In mathematics, the phrase "almost all" has a number of specialised uses which extend its intuitive meaning.
==Cardinality==
"Almost all" is sometimes used synonymously with "all but () finitely many" (formally, a cofinite set) or "all but a countable set" (formally, a cocountable set); see almost.
A simple example is that almost all prime numbers are odd, which is based on the fact that all but one prime number are odd. (The exception is the number 2, which is prime but not odd.)
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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