Answer Happy

3. = = п (a) Let A = {(x, y) E R2 | x + 0,7 +0}. Is A an open subset of R2? (b) Let An (14,1 – 4) and Bm = (0,1+ ) where n e Z>o. Find Nnezso An and ] 5 Unezzo An and also Nnezzo Bn and Unezso Bn (c) Let A = {x € Rd,|||||| <1}. Show that A is a closed subset of Rd. = 2