Element of the integers

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Let A = Z x Z (where Z is the set of all integers) and B = {2k : k is an element of the integers}. Show that f: A --> B  via the assignment f(m,n) = 20n +6m 

a) defines a function 

b) is a surjective function 

Please include all of your work, this question is under the "full justification section".

Reference no: EM131301839

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