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Beltrami, Eugenio

(Encyclopedia)Beltrami, Eugenio āo͞ojĕˈnyō bālträˈmē [key], 1835–99, Italian mathematician. He is famous for his work on non-euclidean geometry, electricity, and magnetism. ...

Smith, Henry John Stephen

(Encyclopedia)Smith, Henry John Stephen, 1826–83, British mathematician. He was a lecturer in mathematics (1850–73) and, from 1860 to 1883, Savilian professor of geometry at Oxford. He is especially noted for h...

curve

(Encyclopedia)curve, in mathematics, a line no part of which is straight; more generally, it is considered to be any one-dimensional collection of points, thus including the straight line as a special kind of curve...

tangent

(Encyclopedia)tangent, in mathematics. 1 In geometry, the tangent to a circle or sphere is a straight line that intersects the circle or sphere in one and only one point. For other curves and surfaces the tangent l...

sphere

(Encyclopedia)sphere, in geometry, the three-dimensional analogue of a circle. The term is applied to the spherical surface, every point of which is the same distance (the radius) from a certain fixed point (the ce...

Desargues, Gérard

(Encyclopedia)Desargues, Gérard zhārärˈ dəzärgˈ [key], 1591–1661, French mathematician and engineer, a founder of modern geometry. He discovered the theorems on involutions and transversals known by his na...

Playfair, John

(Encyclopedia)Playfair, John, 1748–1819, Scottish mathematician, physicist, and geologist. He was educated at St. Andrews and Edinburgh and taught first mathematics and then physics and astronomy at the latter un...

Wallis, John

(Encyclopedia)Wallis, John wŏlˈĭs [key], 1616–1703, English mathematician. He was Savilian professor of geometry at Oxford from 1649. He systematized the use of formulas, introduced the symbol ∞ for infinity...

Pearson, Karl

(Encyclopedia)Pearson, Karl, 1857–1936, English scientist. He studied law, taught geometry, and applied mathematics and mechanics, and in 1911 became professor of eugenics at the Univ. of London and director of t...

Viète, François

(Encyclopedia)Viète or Vieta, François fräNswäˈ vyĕt, vyātäˈ, vīēˈtə [key], 1540–1603, French mathematician. As a founder of modern algebra, he introduced the use of letters as algebraic symbols and ...