Homework 1
Reminders
• The integers are the set {. . . , −2, −1, 0, 1, 2, . . . }. The real numbers are the set of all (non-imaginary, non-infinity) numbers, including all the integers, e, π, √2, −0.203, etc.
• The notation ∃ means “there exists,” and ∀ means “for all.”
• An integer x is even if there