A binary relation on a set that is reflexive and symmetric is called a compatible relation.
Let A be a set of people and R be a relation on A such that (a,b) is in R if a is friend of b. Show that R is compatible relation.
Let R1 ad R2 be two compatible relations on A. Is a compatible relation? Is a compatible relation?
Give two examples of compatible relation
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sorry I don't know the answer
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because it is tough
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