वैध युक्ति : ~(A ⊃ B) / ∴ A सिद्ध करने के निम्नलिखित चरणों को क्रम में रखें -

1.~~A · ~B

2.~(A ⊃ B)

3.A

4.~(~A ∨ B)

5.~~A

A2, 1, 4, 3, 5

B2, 4, 1, 5, 3

C1, 4, 5, 3, 2

D3, 5, 1, 2, 4

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