Diseases, Conditions, Syndromes

South Korea virus cases hit highest level since March

South Korea reported its highest daily number of coronavirus cases since March on Thursday, with a surge of new infections sparking fears of a major third wave.

Diseases, Conditions, Syndromes

Turkey records its highest virus death toll

Turkey on Friday reported 141 new deaths from the coronavirus, the highest single toll since its first recorded death in March.

Diseases, Conditions, Syndromes

Belgium going in 'right direction' with virus figures

A month-long semi-lockdown in Belgium is working to limit the spread of and deaths by COVID-19, health authorities said Wednesday, while urging continued vigilance.

Diseases, Conditions, Syndromes

Dutch virus restrictions to be eased amid falling infections

Dutch Prime Minister Mark Rutte eased his country's coronavirus measures Tuesday amid falling infection rates, allowing public venues including cinemas, museums and libraries to reopen—with limitations on how many people ...

Diseases, Conditions, Syndromes

Turkey's COVID-19 deaths returns to April levels

Turkish health ministry statistics show 93 people died in one day of COVID-19 amid a surge in infections, bringing the daily death toll to numbers last seen in April.

Diseases, Conditions, Syndromes

Europe now region hardest hit by virus infections

Europe has become the region with the highest number of registered cases of the new coronavirus, according to a tally by AFP at 1100 GMT on Thursday based on health authority data.

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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