ファジィ集合
A ⋅ B ⟺ def μ A ⋅ B ( x ) := μ A ( x ) ⋅ μ B ( x ) {\displaystyle A\cdot B{\stackrel {\text{def}}{{}\iff {}}}\mu _{A\cdot B}(x):=\mu _{A}(x)\cdot \mu _{B}(x)}