In 22—29, find all greatest, least, maximal, and minimal elements for the relations in each of the referenced exercises.
28. Exercise 20
To find the greatest, least, maximal and minimal elements for the relations in the given exercise.
Reference to the exercise 20.
Let and consider the partial order relation defined on , for all ordered triplets
and in ,
, and where denotes “less than or equal to” rational for real numbers.
The following are the values of the triplets of and
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