集合と命題（数学Ⅰ）
高校数学Ⅰの分野「集合と命題」の解説記事。 例えば東京都は日本の都道府県に含まれますね。日本の都道府県は47個からできています。それぞれの要素は東京都だったり、大阪府だったり、沖縄県だったりするわけです。日本は集合、それぞれの都道府県は要素または元といいます。 つまり集合とは元が集まったものです。下の記事では高校数学Ⅰで扱う集合と命題をよりくわしく解説しています。
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