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tomboi03
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Let f: A->B and g: B->C
a. C0[tex]\subset[/tex]C, show that (g o f)-1(C0))=f-1(g-1(C0)).
b. If f and g are injective, show that g o f is injective
c. If g o f is injective, what can you say abuot injectivity of f and g?
d. If f and g are surjective, show that g o f is surjective.
e. If g o f is surjective, what can you say about surjectivity of f and g.
f. Summarize your answers to (b)-(e) in the form of a theorem
I don't know how to do this... can someone else me..?
Thank You
a. C0[tex]\subset[/tex]C, show that (g o f)-1(C0))=f-1(g-1(C0)).
b. If f and g are injective, show that g o f is injective
c. If g o f is injective, what can you say abuot injectivity of f and g?
d. If f and g are surjective, show that g o f is surjective.
e. If g o f is surjective, what can you say about surjectivity of f and g.
f. Summarize your answers to (b)-(e) in the form of a theorem
I don't know how to do this... can someone else me..?
Thank You