QMS 110 Week 1 Chapter 1

N

N = {1, 2, 3, . . .}


Z
Z Z = {. . . , −3, −2, −1, 0, 1, 2, 3, . . .}


Q a
a
b a b
b
a
Q = { | a, b ∈ Z, b #= 0}
b


I




R




integer

natural

7 rational
13
1
= 0.3 rational
3
√
3 53
irrational
2

π irrational

irrational

, 


 x if x ≥ 0
|x| =


 −x if x < 0




|6| = 6



|−6| =
6

√
|− 5| = 55


| 2.73 | = 2.73


IT
|−π| =




| −3 − | − 5 | | =
1- 3- 5 / =
1-81=8
FE




12
=2
6

4 > −3

−10 < −7




0
x
0
1
x


00
1 1
−4 · =1
−4 −4

3 5 3 5
· =1
5 3 5 3