In: Advanced Math
Let f: X→Y and g: Y→Z be both onto. Prove that g◦f is an onto function
Let f: X→Y and g: Y→Z be both onto. Prove that f◦g is an onto function
Let f: X→Y and g: Y→Z be both one to one. Prove that g◦f is an one to one function
Let f: X→Y and g: Y→Z be both one to one. Prove that f◦g is an one to one function