All articles starting with E
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Exponential growth
Exponential growth, also called geometric growth, is increase at a rate proportional to the current value, giving a constant doubling time; it models populations, epidemics, and compound interest.
Exponential integral
The exponential integral, or Ei function, is a special function defined by the integral of e−t/t, introduced by Legendre in 1811 and arising throughout physics and engineering.
Exponential integrator
An exponential integrator is a time-stepping method for stiff or oscillatory semilinear differential equations that solves the linear part exactly through a matrix exponential, dating to the 1960s.
Exponential map (Riemannian geometry)
The exponential map of a Riemannian manifold sends a tangent vector at a point to the endpoint of the geodesic starting there, and underlies normal coordinates and geodesic completeness.
Exponential search
Exponential search, also called doubling search or galloping search, is a search algorithm for sorted arrays, described by Jon Bentley and Andrew Yao in 1976.
Exponential smoothing
Exponential smoothing, also known as Holt-Winters, is a family of time series forecasting methods that weight recent observations more heavily, proposed in the late 1950s.
Exponential stability
Exponential stability is a strong form of stability of an equilibrium point of a dynamical system: nearby solutions converge to it at least as fast as a decaying exponential.
Exponential sum
An exponential sum, also called a trigonometric sum, is a finite sum of complex roots of unity, central to analytic number theory since Gauss's 1801 work.
Exponential time differencing
Exponential time differencing (ETD) is a family of numerical methods for stiff semilinear differential equations that integrates the linear part exactly with matrix exponentials, dating to the 1960s.
Exponential time hypothesis
The exponential time hypothesis (ETH) is an unproven conjecture in computational complexity theory, proposed by Impagliazzo and Paturi in 2001, stating that 3-SAT cannot be decided in subexponential time.
Exponentiation
Exponentiation is the arithmetic operation that raises a base to an exponent, written as a superscript; for positive integer exponents it means repeated multiplication, extending to zero, negative, rational, real, and complex exponents.
Exponentiation by squaring
Exponentiation by squaring, also called binary exponentiation or the square-and-multiply algorithm, computes large powers using multiplications proportional to the logarithm of the exponent, making modular exponentiation in RSA practical.
Export
An export is a shipment of goods from one economy to a buyer in another, recorded in trade statistics when the goods leave its customs territory.
Export Administration Regulations
The Export Administration Regulations (EAR) are United States export control regulations, enforced by the Commerce Department's Bureau of Industry and Security, covering dual-use, civilian, and certain military items.
Export Credit Guarantee Corporation of India
Export Credit Guarantee Corporation of India (ECGC), set up in 1957, is a Government of India export credit insurer under the Commerce Ministry, covering exporters and banks against commercial and political non-payment risks; FY 2025-26 exports supported ₹9.70 lakh crore.
Export of cryptography from the United States
The export of cryptography from the United States has been controlled since the Cold War, first under ITAR as a munition and since 1996 under the Commerce Department's regulations.
Export of non-coding RNAs
Export of non-coding RNAs is the transport of snRNAs, snoRNAs, and tRNAs between the nucleus and cytoplasm, using dedicated export receptors such as CRM1 and Exportin-t.
Export production
Export production (EP) is the organic carbon produced in the ocean's sunlit surface layer that sinks toward the deep ocean, linking photosynthesis to the biological carbon pump.
Export-Import Bank of China
The Export-Import Bank of China (中国进出口银行), or China Eximbank, is a state policy bank founded in 1994 to support China's foreign trade and outbound investment.
Export-led growth
Export-led growth is a development strategy in which a country treats export expansion, typically of manufactured goods, as the main engine of economic growth, as in South Korea.
Export–Import Bank of the United States
The Export–Import Bank of the United States, also known as Ex-Im Bank, is the official US export credit agency, founded in 1934, offering loans, guarantees, and insurance.
Exposé (group)
Exposé (ek-spo-zay) is an American Miami-formed female vocal trio (1984) created by producer Lewis A. Martineé; the Jurado/Bruno/Curless lineup's 1987 album Exposure yielded four Top 10 hits including "Seasons Change," distinct from Robert Fripp's Exposure band and UK punk Expose.
Exposed (2016 film)
Exposed (2016), originally Daughter of God, is an American crime drama starring Keanu Reeves and Ana de Armas, credited to pseudonymous director Declan Dale after Gee Malik Linton disowned the studio's recut of his film.
Exposed node problem
The exposed node problem, also called the exposed terminal problem, is a wireless networking issue in which a station defers transmission although it would not interfere, reducing throughput.
Exposition (narrative)
Exposition (narrative) is the delivery of background information, characters, setting, prior events, in a story; also called telling versus showing, with direct and indirect forms, plot placement, info-dump craft advice, and computational uses.
Exposition Park (Pittsburgh)
Exposition Park was a wooden baseball ballpark in Pittsburgh, Pennsylvania, best known as home of the Pittsburgh Pirates from 1891 to 1909 and demolished in 1915.
Exposition Universelle (1889)
Exposition Universelle of 1889, Paris world's fair (15 May to 6 November 1889) marking the centenary of the French Revolution on a 95-hectare site; built the Eiffel Tower, drew millions of visitors, and staged a large colonial exhibit.
Exposition Universelle (1900)
The Exposition Universelle of 1900, or 1900 Paris Exposition, was a world's fair held 14 April to 12 November 1900 with 50,860,801 visitors, 40 countries, the Grand Palais, Petit Palais, and Paris's first metro line.
Expository preaching
Expository preaching, or expositional preaching, is Christian preaching whose message, structure, and emphasis are drawn from and controlled by a biblical passage, making the text's point the sermon's point, in contrast to topical and textual preaching.
Exposure (photography)
Exposure, also known as photographic exposure, is the amount of light reaching film or a digital sensor in photography, controlled by shutter speed, aperture, and ISO.