Numbers Flashcards
1
Q
Natural numbers
A
N whole postive numbers
2
Q
rational numbers
A
Q numbers which can be written as a fraction of intergers
3
Q
Intergers
A
Z whole postive and negative numbers
4
Q
Irrational numbers
A
R/Q numbers which cannot be written as a fraction of an interger ( surds are irrational)
5
Q
composite numbers
A
any number that isnt prime
6
Q
What is proof by contradiction
A
to prove by contradiction that A is true first assume that not ‘A’ is true.Then follow not ‘A’ to an impossibility.If not A is impossible then A must be true
