Numbers can be classified according to how they are represented or according to the properties that they have.
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Main types[edit]
Natural numbers (): The counting numbers {1, 2, 3, ..} are commonly called natural numbers; however, other definitions include 0, so that the non-negative integers {0, 1, 2, 3, ..} are also called natural numbers. Natural numbers including 0 are also called whole numbers.[1][2]
Integers (): Positive and negative counting numbers, as well as zero: {.., −3, −2, −1, 0, 1, 2, 3, ..}.
Rational numbers (): Numbers that can be expressed as a ratio of an integer to a non-zero integer.[3] All integers are rational, but the converse is not true; there are rational numbers that are not integers.
Real numbers (): Numbers that can represent a distance along a line. They can be positive, negative, or zero. All rational numbers are real, but the converse is not true.
Irrational numbers: Real numbers that are not rational.
Imaginary numbers: Numbers that equal the product of a real number and the square root of −1. The number 0 is both real and imaginary.
Complex numbers (): Includes real numbers, imaginary numbers, and sums and differences of real and imaginary numbers.
Hypercomplex numbers include various number-system extensions: quaternions (), octonions (), sedenions (), trigintaduonions (?), tessarines, coquaternions, and biquaternions.
p-adic numbers: Various number systems constructed using limits of rational numbers, according to notions of 'limit' different from the one used to construct the real numbers.
Number representations[edit]
Decimal: The standard Hindu–Arabic numeral system using base ten.
Binary: The base-two numeral system used by computers.
Hexadecimal: Widely used by computer system designers and programmers, as they provide a more human-friendly representation of binary-coded values.
Octal: Occasionally used by computer system designers and programmers.
Duodecimal: The most convenient numeral system, due to twelve's divisibility by a wide range of the most elemental numbers {1, 2, 3, 4}.
Sexagesimal: Originated with the ancient Sumerians in the 3rd millennium BC, was passed down to the ancient Babylonians
(See positional notation for information on other bases)
Roman numerals: The numeral system of ancient Rome, still occasionally used today.
Tally marks: usually used for counting things that increase by small amounts and don't change very quickly.
Fractions: A representation of a non-integer as a ratio of two integers. These include improper fractions as well as mixed numbers.
Continued fraction: An expression obtained through an iterative process of representing a number as the sum of its integer part and the reciprocal of another number, then writing this other number as the sum of its integer part and another reciprocal, and so on. Omnioutliner pro 4 5 1 download free.
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Scientific notation: A method for writing very small and very large numbers using powers of 10. When used in science, such a number also conveys the precision of measurement using significant figures.
Knuth's up-arrow notation, Conway chained arrow notation, and Bowers's operators : Notations that allow the concise representation of some extremely large integers such as Graham's number.
Signed numbers[edit]
Positive numbers: Real numbers that are greater than zero.
Negative numbers: Real numbers that are less than zero.Because zero itself has no sign, neither the positive numbers nor the negative numbers include zero. When zero is a possibility, the following terms are often used:
Non-negative numbers: Real numbers that are greater than or equal to zero. Thus a non-negative number is either zero or positive.
Non-positive numbers: Real numbers that are less than or equal to zero. Thus a non-positive number is either zero or negative.
Types of integer[edit]
Even and odd numbers: An integer is even if it is a multiple of two, and is odd otherwise.
Prime number: An integer with exactly two positive divisors: itself and 1. The primes form an infinite sequence 2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, ..
Composite number: A number that can be factored into a product of smaller integers. Every integer greater than one is either prime or composite.
Polygonal numbers: These are numbers that can be represented as dots that are arranged in the shape of a regular polygon, including Triangular numbers, Square numbers, Pentagonal numbers, Hexagonal numbers, Heptagonal numbers, Octagonal numbers, Nonagonal numbers, Decagonal numbers, Hendecagonal numbers, and Dodecagonal numbers.
There are many other famous integer sequences, such as the sequence of Fibonacci numbers, the sequence of factorials, the sequence of perfect numbers, and so forth, many of which are enumerated in the On-Line Encyclopedia of Integer Sequences.
Algebraic numbers[edit]
Algebraic number: Any number that is the root of a non-zero polynomial with rational coefficients.
Transcendental number: Any real or complex number that is not algebraic. Examples include e and π.
Trigonometric number: Any number that is the sine or cosine of a rational multiple of pi.
Quadratic surd: An algebraic number that is the root of a quadratic equation. Such a number can be expressed as the sum of a rational number and the square root of a rational.
Constructible number: A number representing a length that can be constructed using a compass and straightedge. These are a subset of the algebraic numbers, and include the quadratic surds.
Algebraic integer: An algebraic number that is the root of a monic polynomial with integer coefficients.
Non-standard numbers[edit]
Transfinite numbers: Numbers that are greater than any natural number.
Ordinal numbers: Finite and infinite numbers used to describe the order type of well-ordered sets.
Cardinal numbers: Finite and infinite numbers used to describe the cardinalities of sets.
Infinitesimals: Nilpotent numbers. These are smaller than any positive real number, but are nonetheless greater than zero. These were used in the initial development of calculus, and are used in synthetic differential geometry.
Numbers Math
Hyperreal numbers: The numbers used in non-standard analysis. Imageranger pro 1 5 5 1272 download free. These include infinite and infinitesimal numbers which possess certain properties of the real numbers.
Surreal numbers: A number system that includes the hyperreal numbers as well as the ordinals. The surreal numbers are the largest possible ordered field.
Computability and definability[edit]
Computable number: A real number whose digits can be computed using an algorithm.
Definable number: A real number that can be defined uniquely using a first-order formula with one free variable in the language of set theory.
References[edit]
- ^Weisstein, Eric W.'Natural Number'. MathWorld.
- ^'natural number', Merriam-Webster.com, Merriam-Webster, retrieved 4 October 2014
- ^W., Weisstein, Eric. 'Rational Number'. mathworld.wolfram.com.
Numbers To Words
Retrieved from 'https://en.wikipedia.org/w/index.php?title=List_of_types_of_numbers&oldid=984719786'
The book of numbers is largely Narrative History as far as its genre. It was written by Moses about 1450-1410 B.C. Key personalities include Moses, Aaron, Miriam, Joshua, Caleb, Eleazar, Korah, and Balaam.
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The purpose of the book of Numbers is to tell about how Israel prepared to enter the promise land, but sinned and was punished. It describes Moses taking two population censuses, hence the name Numbers.
• From chapters 1-9 the Israelites are preparing for their journey and entry into the promise land. Moses begins by taking a census of all the tribes, primarily to see how many men are available and in shape for military service. Next, Moses dedicates the Levites and instructs the Nazirite vows and laws. During this time, the Israelites celebrate the 2nd Passover one year after their exit from bondage.
• In chapters 10-12, the Israelites travel from the wilderness in Sinai to approach the promise land. The people complain about their food, God gives them quail, and because of their greed, He also sends them a plague. Miriam and Aaron learn a lesson about whom God places in leadership.
Numbers 6:24-26
• In chapters 13-19, we see severe punishment for disobedience and unfaithfulness to God. Moses sends out 12 spies to perform reconnaissance on the promise land. The 12 spies return and only two of them bring good news. The people fear the occupants and rebel against taking the land. For this God punishes them and sends them into the wilderness for forty years to roam.
Numbers In French
• The last chapters of Numbers, from 20-36, the new generation of Israelites again attempt to enter the land to take it as God promised. This time they easily destroy two nations that confront them as they are entering. Balak uses his prophet Balaam to learn to seduce the Israelites to worship Baal. Because of this disobedience, about 24,000 people die, including Balaam. Before the book of Numbers ends, Moses again conducts a census, and Joshua assumes the leadership of Israel in place of Moses who is banned from the promise land, due to his disobedience.