🔸結合律
運算 ⟩ 二元運算 ⟩ 結合律 (associativity)
「Group╱群」的運算具有「結合律」。
Abstract and Linear Algebra (Burton) ⟩ 2.1 Definition and Elementary Properties of Groups (p. 43, 44)
Understanding Analysis ⟩ 8.6 A Construction of R From Q, Def. 8.6.4 (p.299)
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