[ Mathematics ] Open Question : Write down the negations of the following expressions, so that the ¬ symbol does not arise to the left of any quantifier.?

...Indicate whether the negated statement is true a) ∀x ∈ N, x^2 ∈ N and 1/2x ¬∈ N. b) ∀x ∈ R, ∃n ∈ Z, x^n > 0.

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