Prove Proposition 6.10 (Let f : X → Y and g : Y → Z be...

Prove Proposition 6.10 (Let f : X → Y and g : Y → Z be one to one and onto functions. Then g ◦ f : X → Z is one to one and onto; and (g ◦ f)⁻¹ = f⁻¹ ◦ g⁻¹ ).

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Colby Messinger answered 1 year ago

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