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Symbols
Terminology
Sets of Numbers
Set Equivalence/ Set Equality
Misc./ Problems
100
Equals
What is the meaning of the symbol "="
100
A collection of objects
What is a set?
100
All numbers from 1 and up {1,2,3...}
What are natural numbers?
100
~
What is the symbol for set equivalence?
100

An indication the border # is excluded in the interval notation

What is a round parenthesis?

200

It means the elements of set will be listed inside

What is the meaning of these symbols, {___}

200
A member of the set.
What is an element?
200
All numbers from 0 up {0,1,2,3...}
What are whole numbers?
200
=
What is the symbol for set equality?
200
If the cardinal number of a set is a particular whole number.
What is a finite set?
300
It is the "an element of" symbol
What is this symbol ϵ
300
A set containing no elements.
What is an empty set?
300
All negative and positive numbers and 0 {...-3,-2,-1,0,1,2,3...}
What are integers?
300
When every element of A is in B and every element of B is in A
What is A = B in set equality?
300
Is this set finite or infinite? {2, 4, 6, ... 32}
finite
400
It is the "not an element of" symbol
What is ∉
400
Math that deals with sets.
What is set theory?
400
Any number that can be written as a ratio of two integers with a nonzero denominator
What are rational numbers?
400
When |A| = |B|
What is A ~ B in set equivalence?
400

Is this set finite or infinite? {x | x is a natural number greater than 50}

infinite

500
This is the "empty set" or "null set" symbol
What is ∅ or {}
500

It represents the number of elements in a set.

What is the cardinal number?

500
Any number that can NOT be written as a ratio of two integers
What are irrational numbers?
500
True or False: {j,e,n} = {j,e,n,n,i,f,e,r} in set equality?
False, all of set B is not in set A.
500
The set containing all the rational and irrational numbers.
What is the set of real numbers.