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Q : Explain the approach of answer I am not clearly getting the definition of the terms Lower bound and upper bound?

closed with the note: doubt cleared by myself
in Mathematical Logic by (87 points)
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1 Answer

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From the Hasse diagram, it is clear that in the subset { a, c, d, f }

Elements { a, c, d, f } joins at either f or j or h. Hence f, j and h are upper bounds for the subset and among f, j and h,

f is least upper bound

 

Elements { a, c, d, f } meet at ‘a’. Hence ‘a’ is lower bound. In fact, ‘a’ is greatest lower bound

by (688 points)
0

how {a,c,d,f} can join at either f or j or h because d is connected to g what about g .

what is the method to find the upper bounds?

0

Look at the diagram

g is connected to f also

and

a and c are also joining at f with g and f 

See the common join point at the higher level to get the upper bounds

 

Hope this will help you

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