Security

One hack, 106 million people, Capital One ensnared by breach

A security breach at Capital One Financial, one of the nation's largest issuers of credit cards, compromised the personal information of about 106 million people, and in some cases the hacker obtained Social Security and ...

Internet

US fine on Facebook puts CEO Zuckerberg on the hook

A record $5 billion fine slapped on Facebook by US regulators on Wednesday came with conditions that included putting chief executive Mark Zuckerberg on the hook for future privacy violations.

Security

What to do if your identity was stolen in mass identity breach

News recently that a malware attack at Detroit-based Wolverine Solutions Group, which handles mailing and other services for hundreds of health care companies, potentially exposed the personal information of hundreds of thousands ...

Computer Sciences

Securing the 'internet of things' in the quantum age

MIT researchers have developed a novel cryptography circuit that can be used to protect low-power "internet of things" (IoT) devices in the coming age of quantum computing.

Consumer & Gadgets

iPhone FaceTime bug lets callers eavesdrop

A newly discovered FaceTime bug lets people hear and even see those they are reaching out to on iPhones even if the other person hasn't answered their phone.

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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