# Math Help - LUB, GLB, maximum and minimum of a set .

1. ## LUB, GLB, maximum and minimum of a set .

I am not sure if my solution for the following problem is correct, in my class I have never seen GLB to be ∞ . Could it not exist?

Evaluate LUB, GLB, maximum and minimum (if they exist) of {n:nN}.

If a set has NO lower bound then we say that the "GLB" is $-\infty$.