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8. Which of the following formulas are tautologies of first order logic?: (a) x=y. b) x-x. (c) yx (x=x (f) Va -R(x,y) - R(x, y

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8. Which of the following formulas are tautologies of first order logic?: (a) x=y. b) x-x. (c) yx (x=x (f) Va -R(x,y) - R(x, y 8. Which of the following formulas are tautologies of first order logic?: (a) x=y. b) x-x. (c) yx (x=x (f) Va -R(x,y) - R(x, y

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