Hasse Doubt

Question

what is the least upper bound of {a, b, c}?

Comments

The least Upper bound of {a,b,c} =k

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LUB=k

UB=k,l,m

GLB=not exists

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LUB OF {a,b,c} = k

Answer 1

UB({a, b, c}) = {k, l, m}

Least{k, l, m} = k

So, LUB({a, b, c}) = k

Answer 2

UB of {a,b,c} = {k,l,m}

so LUB = K