- #1
ripcity4545
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Homework Statement
The problem is :
For the functions from N*N --> N, determine if the following functions are surjective:
f(a, b) = a + b
f(a, b) = ab(b+1)/2
Homework Equations
N is all natural numbers
The Attempt at a Solution
My problem is I know the definition of surjective, but I don't know what to do with f(a, b) because I've never seen this before. THanks for the help!