Chapter 2.1 Flashcards
1
Q
What is a set?
A
A collection of objects
2
Q
What are objects that belong to a set called?
A
Elements (members)
3
Q
Natural numbers
A
Weird N={1,2,3,4…}
Counting numbers
4
Q
Whole numbers
A
W={0,1,2,3,4…}
Natural numbers plus 0
5
Q
Integers
A
Weird Z={…-3,-2,-1,0,1,2,3}
6
Q
Rational Numbers
A
Weird Q={X/y|x€Z, y€Z, y not equal 0}
This is all fractions, terminating decimals, and repeating decimals.
All integers are rational numbers
7
Q
Irrational Numbers
A
I= the set of all non-terminating, non-repeating decimals
Ex: square root of 2, e, Pi, and -1.010010001….
8
Q
Real Numbers
A
Weird R= {x| X€Q or X€I}
9
Q
Classify:
-3
A
Z, Q, R
10
Q
Weird N
A
Natural numbers
11
Q
W
A
Whole numbers
12
Q
Weird Z
A
Integers
13
Q
Weird Q
A
Rational numbers
14
Q
I
A
Irrational numbers
15
Q
Weird R
A
Real numbers
