In Exercises compute the indicated quantities for the given homomorphism ϕ. (See Exercise 46.)
Ker(ϕ) and ϕ(4, 6) for ϕ : ℤ × ℤ → ℤ × ℤ where ϕ(1,0) = (2, -3) and ϕ(0, 1) = (-1,5)
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