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4 cards from this section. Quick, good the night before a test.
Define union in the context of relations.
Think about combining all tuples.
What is the intersection of two relations?
What is shared between both sets?
What does the union of two relations give?
Think about including both sets' data.
True or False: The intersection of two relations can produce a non-empty set.
What does shared mean in set terms?
Given the relations R = {(1,2), (2,3), (3,4)} and S = {(2,3), (3,5)}, calculate R U S and R ∩ S.
Combine or find common elements based on their definitions.
How does it demonstrate the properties of relations if you were to compose R and S and then find the reflexive closure?
Think of how composition tracks changes through paths, and closure ensures completeness.
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