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Real Number System
Set of all decimal #'s

1.456445
 1. Decimal #
 2.Pos Finite Decimal Expansion


1,2,3,4,5,6,...,100,...,1000
Natural Numbers

N = { 1, 2, 3, 4, 5, 6, . . . , n, . . . }
The Set Of All Natural Numbers

The Set Of all Natural Numbers
N = { 1, 2, 3, 4, 5, 6, . . . , n, . . . }.

N represents what when refering to a set?
The set of all natural numbers

Integers consist of....
 natural #'s
 neg natural #'s
 0

Give integer examples
. . . , −4, −3, −2, −1, 0, 1, 2, 3, 4, . . .

The set of all integers is denoted by what letter?
Z

The set of all integers z is what type of set?
Infinite

⊆
Has more or is equal to

∈
THE MEMBER OF/BELONGS TO

If p is an integer, what can be said about 2p?
(a) 2p is an odd number
(b) 2p is an even number
 (b) 2p is an even number
 Explanaiton: p ∈ Z, so 2p is an even integer. Even if p is a neg/pos# when mult by two it becomes even. ex: 2(7)=14 2(15)=30 2(4)=8. Also zero is neither negative or positive so dont worry about 2(0) because the question only asked if it would be neg/pos

