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Homework Statement
How do I check if my function is surjective?
How do I check if my function is injective?
Suppose my function is a predicate and hence characteristic function of some set. How do I determine such a set?
Homework Equations
Does anyone know to write "The function f: A->B is not surjective? and The function f:A-> B is not injective?" in SYMBOLS using quantifiers and operators.
The Attempt at a Solution
If I have two finite sets, and a function between them. I can compute the value of the function at each point of its domain, I can count and compare sets elements, but I don't know how to do anything else.
I need detailed, explicit instructions for answering the questions IN WORDS. Can anyone help me to solve this problem.
Cheers mate
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