Check the injective and surjective of th...

Check the injective and surjective of the following functions : `f : Z rarr Z` given by `f(x) = x^3`

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We have `f(x_1) = f(x_2)`
`implies x_1^3 = x_2^3 implies x_1 = x_2` for all `x_1, x_2` in Z
`therefore` f is not surjective

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