Hi folks, I just wanted to "check my answers" -

here is a poset ({2,4,6,9,12,18,27,36,48,60,72},|)

that's "|" is divide (divisibility)

What's the answer for

1) upper bound of {2,9}

my answer) 18,36,72

2)least upper bound of {2,9}

my answer) 18

3)lower bounds of {60,72}

my answer) 6,2

4)greatest lower bound of {60,72}

my answer) 6

I wish Soroban knew some discrete math. He seems to be a nice guy!