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April 20th, 2013, 10:02 PM   #1
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Subset of a Function g[a] subset g[b]

Hi thanks for your help,

Given a function g: X -> Y , and A subset B subset X , prove that g[A] subset g[B]


It seems kinda obvious to me, since a function cannot map to more than one element and A subset B is given, i'm unsure how to write this as a proof however?
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April 21st, 2013, 07:20 AM   #2
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Re: Subset of a Function g[a] subset g[b]

Given an element a in A, show that g(a) is in G(B).
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