Question

What is the difference between rational/irrational number, integer, real number, complex number and natural number ?

Answer 1

rational- number that can be expressed as fraction.
irrational- PI cant be expressed as fraction.
Integer- Any whole real number
Real number- any normal number-- PI, 1, 1.25 etc
complex- a number with an imaginary component- 1+i
natural number- nonnegative integer

Answer 2

medal please

Answer 3

PI is prime integer ?
what is a imaginary component ?

Answer 4

PI is not an integer.
Imaginary component just has the letter i in it like 1+2i

Answer 5

http://www.youtube.com/watch?v=57unv_eJC14

Answer 6

http://hotmath.com/hotmath_help/topics/number-systems.html

Answer 7

in other words an "imaginary number"
i=sqrt(-1)
complex number= a+bi where a and b are any real number

Answer 8

watch them all u will understand more lol @rox13kh

Answer 9

thx for the link @Yahoo!

Answer 10

welcome>>>

Answer 11

getting the hang of it i guess @ivan514 thx

Answer 12

so PI is a prime number ?

Answer 13

mmm can others give answers too ?
just to make sure

Answer 14

Hey rox13kh, did you understand this?

Answer 15

I still don't get rational and complex

Answer 16

A rational number is of the form
\[\frac{a}{b}\]
where b can't be 0
a can be any whole number
like \(\frac{2}{4}\) or \(\frac{2}{1}\)

Answer 17

thx so irrational are those with denominators 0 and decimal ? ?
how about complex

Answer 18

nope, irrational are numbers which can't be expressed as a/b
like \(\sqrt 2\) or \(\pi\)

Answer 19

got it.
what are complex numbers ?

Answer 20

a wait.. can't pi be expressed as 22/7 ? ?

Answer 21

you know if we have
\[\sqrt{-1}\]
it's represented as i
so
\[i=\sqrt{-1}\]
this is called an imaginary number
A number of the form
\[a+ib\]
is a complex no.
Do you get till here?

Answer 22

yeah2 u can continue

Answer 23

here a is the real part and b is the imaginary part
You know it's amazing that every number is a complex number,
2 is a complex no. with 0 imaginary part
\(\sqrt {-1} \) is a complex no. with 0 real part

Answer 24

got it
thx a lot ^^

Answer 25

You;re welcome. @rox13kh anytime you need help here, do let me know

Answer 26

sure