Exercise.  Determine the truth value of each expression, given that the domain of all the variables is the set of real numbers. ∀x∃y (x² = y) ∀x∃y (x = y²) ∀y∃x (x = y²) ∃m∀n (mn = 0) ∃a∃b (a + b ≠ b + a) ∀x∃y (x + y = 1)

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