Please edit your post. There must be several mistakes there.
Hey, i'm relatively new to the forums...just a little curious on how to solve this proof.
1. Determine whether f:Z X Z -> Z is onto if...
a) f(m , n) = 2m-n
c) f(m , n) = m+n+1
note: Z represents integers.
i) Determine if the function is Injective (one to one).
ii) Prove 1a.
iii) Determine if the function is Surjective (onto).
iv) Prove 1c.
It should be fixed now to the correct format.
According to the definition of Onto, "A function f: X → Y is surjective if and only if its range f(X) is equal to its codomain Y." So I'm guessing both a) and c) are onto because either way were going to end up with integers. Although, I'm not really sure how to prove this.