The symbol for rational numbers is Q .
the set of integersU+2124. ℤ Represents the set of integers. (The Z is for Zahlen, German for "numbers", and zählen, German for "to count".)
The set of all rational numbers, also referred to as "the rationals", the field of rationals or the field of rational numbers is usually denoted by a boldface Q (or blackboard bold.
Set notation is used to define the elements and properties of sets using symbols. Symbols save you space when writing and describing sets. Set notation also helps us to describe different relationships between two or more sets using symbols.
A letter of the alphabet drawn with doubled vertical strokes is called doublestruck, or sometimes blackboard bold (because doublestruck characters provide a means of indicating bold font weight when writing on a blackboard).
\mathbb N makes the slanted line bold.Apr 17, 2019
natural numbersIn mathematics, N is the symbol for natural numbers. N is represented as the set of natural numbers.
the set of natural numbersN denotes the set of natural numbers; i.e. {1,2,3,…}. Z denotes the set of integers; i.e. {…,−2,−1,0,1,2,…}. Q denotes the set of rational numbers (the set of all possible fractions, including the integers). R denotes the set of real numbers.
such thatThe symbol ∃ means “there exists”. Finally we abbreviate the phrases “such that” and “so that” by the symbol or simply “s.t.”. When mathematics is formally written (as in our text), the use of these symbols is often suppressed. In this class, you may use them freely.
2:3012:31How to - use set notation for Venn diagrams - YouTubeYouTubeStart of suggested clipEnd of suggested clipThe curly brackets just tell you which numbers belong to which set so the odd numbers belong to setMoreThe curly brackets just tell you which numbers belong to which set so the odd numbers belong to set a and the factors of eight belong to set B.
A set-builder notation describes the elements of a set instead of listing the elements. For example, the set { 5, 6, 7, 8, 9} list the elements. We read the set {x is a counting number between 4 and 10} as the set of all x such that x is a number greater than 4 and less than 10.