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3 cards from this section. Quick, good the night before a test.
What is the empty set?
Think of a bag with nothing inside.
Give an example of a singleton set.
A set with just one item can be a singleton.
What does the symbol ϕ represent?
Recall what an empty set indicates.
True or False: The empty set is equal to {ϕ}.
Think about the elements each set contains.
Prove that the empty set is a subset of any set A, using logic and definitions.
Think about how subset definitions work.
Create examples of sets A, B, C such that A is a proper subset of B, and both sets include a singleton set.
What makes one a proper subset.
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