本書は，経済学博士（大阪大学）による経済学を学ぶために必要な数学の入門テキストの第３巻です。今回は，「関数」について非常に分かりやすく解説しています。関数は，需要，供給，生産，消費など経済学の非常に多くの場面に登場するので，関数の理解は経済学の理解に直結しています。経済学を学んでいるあるいは学ぼうと考えている学生や社会人は，ぜひご一読ください。本書で扱っている内容は，独立変数，従属変数，定義域，値域，グラフ，１次関数，２次関数，n次関数，分数関数，増加関数，減少関数，合成関数，逆関数，多変数関数，同次関数，指数関数，指数法則，対数関数，真数，常用対数，自然対数などです。練習問題及びその解答もあります。
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