411 REFERENCE · Wikibooks
Number Theory/Notation and Introduction to proof
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Notation
is the set of positive integers, also called the natural numbers.
is the set of all integers.
is the set of all rational numbers.
is the set of algebraic numbers.
is the set of real numbers.
is the set of complex numbers.
Introduction to Mathematical Proof