Prove that if x and y are real numbers, then max(x, y) + min(x, y) = x + y.
[Hint: Use a proof by cases, with the two cases corresponding to x ≥ y and x < y, respectively.]
Prove that if x and y are real numbers, then max(x, y) + min(x, y) = x + y.
[Hint: Use a proof by cases, with the two cases corresponding to x ≥ y and x < y, respectively.]