Number subsets...help..

[jto1292]

Okey. I'm always confused with this one... WHAT numbers are included in the conventional number subsets... i.e. k is element of C means it occurs in Complex region. I know R is reals. What is included under Z, J and others the might be of importance in this exam?

Thanks for help/

[jasoN-]

N: Natural (R+ integers, may include 0)
J=Z (use Z): Integer (-3, -2, -1, 0, 1 , 2, 3, etc)
Q: Rational (fractions)
R: Real
C: Complex

ie.
most likely we'll only need to use Z and C

[jto1292]

Thank-you Jason! Very useful..  Another thing, do you know the subset for positive whole numbers excluding zero?

[jasoN-]

Natural numbers (N) usually are R+, but sometimes people include 0, doesn't really matter.
Natural numbers refer to positive integers (1, 2, 3 etc) or non-negative integers (therefore 0, 1, 2, 3) i believe

[jto1292]

Thank-you very muchly! In it goes into the summary book.

[3Xamz]

For your last question, I like to say J+ which is all positive whole numbers excluding zero