sets Flashcards

1
Q

A ∪ B:

A

both A or B

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2
Q

A ∩ B:

A

numbers both in A & B

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3
Q

A ⊆ B:

A

every element of A is in B

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4
Q

Ø:

A

empty set

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5
Q

a ∈ A:

A

a is in A

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6
Q

b ∉ A:

A

b is not in A

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7
Q

A ⊂ B:

A

A ⊂ B

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8
Q

A’:

A

everything not in A

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9
Q

n(A):

A

number of items in set A

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