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10 Topic Pages Found in Mathematics & Statistics and starting with the letter R
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Ramsey, Frank Plumpton (1903 - 1930)

British philosopher and mathematician, best known for his work on the foundations of mathematics, but also made remarkable contributions to


The range of a distribution of values is the difference between the highest and lowest values of a variable or score. In other words, it is a single


Measure of the relative size of two quantities or of two measurements (in similar units), expressed as a proportion . For example, the ratio of vowels

Real numbers

A number that can be written in the form ±n:a1a2a3 …, where n is an integer and each a i is one of the digits 0 to 9, for example, 2, ⅓ = 0:333 …,


Quadrilateral (four-sided plane figure) with opposite sides equal and parallel and with each interior angle a right angle (90°). Its area A is the

Open Riemann, Bernhard, 1826-1866
Riemann, Bernhard, 1826-1866

Place : Germany Subject : biography, maths and statistics German mathematician whose work in geometry - both in combining the results of others and in

Right triangle

Triangle in which one of the angles is a right angle (90°). It is the basic form of triangle for defining trigonometrical ratios (for example, sine,

Rittenhouse, David (1732 - 1796)

American instrument maker, inventor, and astronomer. He is credited with being the first to introduce the use of cross hairs (spider web) in transit

Open Roman numerals
Roman numerals

Ancient European number system using symbols different from Arabic numerals (the ordinary numbers 1, 2, 3, 4, 5, and so on). The seven key symbols in

Russell, Bertrand (1872 - 1970)

1872–1970, British philosopher, mathematician, and social reformer, b. Trelleck, Wales. The Early Years Russell had a distinguished background: His