null sets
(humorous) Popular supposed name for a caveman or other prehistoric man.
(journalism) A reporter or freelance journalist who is based in a foreign country, and who provides news reports and/or commentary from that place.
(transitive) To remove the sourness from; to make no longer sour.
plural of null set
組合せ論では、空集合は要素を含まないため通常無視されます。
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