News tagged with number

What's the price of a hepatitis C cure?

Sofosbuvir is one of a number of new direct-acting antiviral drugs revolutionising the care of people living with hepatitis C. Combinations of two or three hepatitis C virus direct-acting antiviral drugs taken for 8-24 weeks ...

Aug 04, 2016
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Do kids grow out of childhood asthma?

When a child is diagnosed with asthma, parents usually have a number of questions. How serious is asthma? Will the child grow out of it? How can it be treated? It can be difficult to get clear answers, as asthma affects different ...

Jul 18, 2016
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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

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