News tagged with number

New ADHD findings

A combination of rare and common genetic variations could play a part in biological pathways linked to Attention Deficit Hyperactivity Disorder (ADHD).

Nov 14, 2011
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Brain structure shows affinity with numbers

The structure of the brain shows the way in which we process numbers. People either do this spatially or non-spatially. A study by Florian Krause from the Donders Institute in Nijmegen shows for the first ...

Dec 12, 2013
popularity 4.5 / 5 (4) | comments 1 | with audio podcast

Is short stature associated with a 'shortage' of genes?

New research sifts through the entire genome of thousands of human subjects to look for genetic variation associated with height. The results of the study, published by Cell Press in the December issue of the American Jo ...

Nov 23, 2011
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Time and numbers mix together in the brain

(Medical Xpress) -- Clocks tell time in numbers -- and so do our minds, according to a new study which will be published in an upcoming issue of Psychological Science, a journal of the Association for Psychological Scienc ...

Jul 19, 2011
popularity 2.3 / 5 (6) | comments 0 | with audio podcast

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.

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