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3 cards from this section. Quick, good the night before a test.
What is a set?
Think about how elements are grouped.
What does '∈' signify?
What do we say when we include something in a set?
What is a set?
Think about what makes a collection a set.
True or False: The empty set and the singleton set containing the empty set are the same.
Remember what elements are included in each type of set.
If A = {1, 2, 3} and B = {3, 4, 5}, what is A ∪ B, A ∩ B, and A - B?
Use the definitions of union, intersection, and set difference.
Provide a proof for the statement: For any set A, the power set P(A) has a cardinality of 2^|A|.
Consider how new subsets are formed when each element is added.
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