For 3(iv) we have . LUB is and GLB is . This is because the rationals are dense in . Neither of these numbers are rational because 11 is prime.
See Q3 on attatched document. Im preparing for a forthcoming exam and always struggle with these type of questions....
for (i) i got: bounded above = yes; LUB = 1; In set = YES; Bounded Below = YES; GLB = 0; In set = no;
Im more confident on this part but not for the other parts. Any help/guidance?