问答题
论述域是{a0,a1,a2,…,an},试证明下列关系式: (a)xP(x)xP(x) (b)xA(x)∧Px(A(x)∧P) (c)x(A(x)∧B(x))xA(x)∧xB(x) (d)x(A(x)∧B(x))xA(x)∧xB(x)