Prove-that-1-Sup-A-B-max-Sup-A-Sup-B-2-inf-A-B-min-inf-A-inf-B-

Question Number 159736 by LEKOUMA last updated on 20/Nov/21

P r o v e t h a t

1) S u p (A \cup B) = m a x (S u p (A), S u p (B))

2) i n f (A \cup B) = m i n (i n f (A), i n f (B))