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2 cards from this section. Quick, good the night before a test.
Define what a subset is.
Think about the relationship between two sets.
What is an intersection of sets?
Consider elements that are found in both sets.
What does A ∩ C represent?
Focus on intersection concepts.
Is the following statement true? 'If A ⊆ B, then A ∩ C will always be a subset of B.'
Think of what changes based on subsets.
Given sets A = {1, 2, 3} and B = {2, 3, 4}, find A ∩ B and examine its implications on A ⊆ B.
Think about which numbers appear in both sets.
Design a relation that is both symmetric and anti-symmetric for set A = {1, 2}.
Reflect on how symmetric requirements restrict your choices.
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