• 2022-07-28
    当个体域为有限集时,如D={a1,a2,…,an},对任意谓词A(x)都有( )是正确的。
    A: ∀xA(x)⇔A(a1)∧A(a2)∧…∧A(an)
    B: ∃xA(x)⇔A(a1)∧A(a2)∧…∧A(an)
    C: ∀xA(x)⇔A(a1)∨A(a2)∨…∨A(an)
    D: ∃xA(x)⇔A(a1)∨┐A(a2)∨…∨┐A(an)