Let A and B be sets of real numbers such that A ⊂ B. Find a
relation among inf A, inf B, sup A, and sup B.
Let A and B be sets of real numbers and write C = A ∪ B. Find a
relation among sup A, sup B, and sup C.
Let A and B be sets of real numbers and write C = A ∩ B. Find a
relation among sup A, sup B, and sup...