Are any of the following statements is correct :
i) 2 | a ⇒ 2| a^2
ii) 2 | a^2 ⇒ 2 | a
iii) 2 | a ⇔ 2 | a^2
for integers a ?

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They look all true.

If you think a statement is false, try to produce a counterexample.

@jayzdd but how do I show it?

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