infimum and minimum

[luckyc1423]

For each subset of R, give its infimum and and the minimum of each set, if they exist. Otherwise write "none"
a) {1,3}
b) {pi, 3}
c) [0,4]
d) (0,4)
e) {1/n: n is an element of N}
f) {1 - 1/n: n is an element of N}
g) {n/(n+1): n is an element of N}
h) {(-1)^n(1+1/n): n is an element of N}
i) {n + (-1)^n/n: n is an element of n}
j) (-infinity, 4)
m) {r is an element of Q: r<5}
n) {r is an element of Q: r^2<=5}

thanks for everyones help!

 

[stapel]

Are you unable to make even an educated guess on any of these...? If this is the case, then I'm afraid you appear to need much more intensive (hands-on) assistance than we are able to provide. Sorry.

My best wishes to you.

Eliz.