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

in Set Theory & Algebra
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The least Upper bound of {a,b,c} =k
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6
LUB=k

UB=k,l,m

GLB=not exists
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LUB OF {a,b,c} = k
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UB of {a,b,c} = {k,l,m}

so LUB = K