Q10Short answer
Let C be the set of complex numbers. Prove that the mapping f : C → R given by f (z) = |z|, ∀ z ∈ C, is neither one-one nor onto.
Let C be the set of complex numbers. Prove that the mapping f : C → R given by f (z) = |z|, ∀ z ∈ C, is neither one-one nor onto.