A number is a mathematical object used to count, label, and measure. In mathematics, the definition of number has been extended over the years to include such numbers as zero, negative numbers, rational numbers, irrational numbers, and complex numbers.
Mathematical operations are certain procedures that take one or more numbers as input and produce a number as output. Unary operations take a single input number and produce a single output number. For example, the successor operation adds one to an integer, thus the successor of 4 is 5. Binary operations take two input numbers and produce a single output number. Examples of binary operations include addition, subtraction, multiplication, division, and exponentiation. The study of numerical operations is called arithmetic.
A notational symbol that represents a number is called a numeral. In addition to their use in counting and measuring, numerals are often used for labels (telephone numbers), for ordering (serial numbers), and for codes (e.g., ISBNs).
In common use, the word number can mean the abstract object, the symbol, or the word for the number.
Read more about Number: Classification of Numbers, Numerals
Other articles related to "number, numbers":
... In July 2011, Bulgaria sent 165 more soldiers making the total number of contributing forces to 767 ... are involved in three locations, additional platoon is on its way to bolster this number, bringing total troop numbers to 350 by the end of 2010/11 ... Croatian parliament voted on extra troop numbers on 7 December with all party supporting troop increase, although parliament did recognize that additional increases in troop numbers might be ...
... From 1922 the first three digits of a seven digit subscriber number—the local exchange codes—were represented with letters by way of a mnemonic ... The subscriber numbers were written, for example, as ABBey 1234 and WIMbledon 1234 or ABB 1234 and WIM 1234 ... By 1965, there were 350 local exchanges in London and the number of permutations that could be used for exchange names had been exhausted ...
... Example telephone number 1959—1966 STD codes introducted 01-ABB 1234 1966—1990 All-figure dialling 01-222 1234 1990—1995 Area code split 071-222 1234 1995—2000 PhONEday ... the same area as the current 020 code and had capacity for fewer than 10 million telephone numbers ... As part of the Big Number Change on 22 April 2000 the 0171 and 0181 codes were replaced with 020, following a period of dual-running that began 1 June 1999 ...
... CA-18s, plus the 84 P-51Ks, used Australian serial numbers prefixed by A68 ... The Mustangs were declared obsolete in 1956, but a number of special-duty versions served on into the early 1960s ... A number of P-51B/P-51Cs (including examples marked with Luftwaffe Geschwaderkennung codes T9+CK, T9+FK, T9+HK and T9+PK) and three P-51Ds were captured ...
... Throughout 2006, Electronic Disturbance Theater joined the borderlands Hacklab for a number of virtual sit-ins, against the massacre in Atenco, in solidarity with ... A computer hacker leaks the personal data of 6 million Chileans (including ID card numbers, addresses, telephone numbers and academic records) from government and military servers to the ... In early 2009, the Israeli invasion of Gaza motivated a number of website defacements, denial-of-service attacks, and domain name and account hijackings, from both sides ...
Famous quotes containing the words numbers and/or number:
“The land cannot be cleansed of the blood that is shed therein, but by the blood of him that shed it.”
—Bible: Hebrew Numbers 35:33.
“The more elevated a culture, the richer its language. The number of words and their combinations depends directly on a sum of conceptions and ideas; without the latter there can be no understandings, no definitions, and, as a result, no reason to enrich a language.”
—Anton Pavlovich Chekhov (1860–1904)