Fill in the blanks to make each of the following a true statement:

(i) A A’ = . . . (ii) ϕ A = . . .


(iii) A A’ = . . . (iv) U’ A = . . .



(i) A A’ = U

(ii) ϕ A = U A = A (as ϕ’ = U)


(iii) A A’ = ϕ


(iv) U’ A = ϕ A = ϕ (as U’ = ϕ)


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