Security

Your old mobile phone number could compromise your cybersecurity

The Department of Computer Science and Center for Information Technology Policy at Princeton University has conducted a study and released a paper assessing the security and privacy risks of phone number recycling by mobile ...

Security

Is your smartphone spying on you?

Some popular apps on your phone may be secretly taking screenshots of your activity and sending them to third parties, according to a new study by a team of Northeastern researchers.

Security

New software continuously scrambles code to foil cyber attacks

As long as humans are writing software, there will be coding mistakes for malicious hackers to exploit. A single bug can open the door to attackers deleting files, copying credit card numbers or carrying out political mischief.

page 1 from 17

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