Business

DoorDash breach exposes data of nearly 5 mn users

On-demand restaurant meal delivery service DoorDash on Thursday said a breach of its system exposed nearly five million customers, eateries and "Dashers" to a data breach.

Security

US wants woman accused in Capital One hack to stay locked up

A woman accused of hacking Capital One and at least 30 other organizations is a flight risk, a threat and should be kept locked up until her trial, U.S. prosecutors said in court documents filed ahead of a Friday detention ...

Security

App allows inspectors to find gas pump skimmers faster

A team of computer scientists at UC San Diego and the University of Illinois has developed an app that allows state and federal inspectors to detect devices that steal consumer credit and debit card data at gas pumps. The ...

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Number

A number is a mathematical object used to count 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.

This text uses material from Wikipedia, licensed under CC BY-SA