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International Atomic Time
International Atomic Time (abbreviated TAI, from its French name ) is a high-precision atomic coordinate time standard based on the notional passage of proper time on Earth's geoid. TAI is a weighted average of the time kept by over 450 atomic clocks in over 80 national laboratories worldwide... |
Alain Connes
Alain Connes (; born 1 April 1947 in Draguignan) is a French mathematician, known for his contributions to the study of operator algebras and noncommutative geometry. He is a professor at the , , Ohio State University and Vanderbilt University. He was awarded the Fields Medal in 1982.
Career
Alain Connes... |
Agricultural science
Agricultural science (or agriscience for short) is a broad multidisciplinary field of biology that encompasses the parts of exact, natural, economic and social sciences that are used in the practice and understanding of agriculture. Professionals of the agricultural science are called agricultural... |
Alien
Alien primarily refers to:
Alien (law), a person in a country who is not a national of that country
Enemy alien, the above in times of war
Extraterrestrial life, life which does not originate from Earth
Specifically, a lifeform with extraterrestrial intelligence
For fictional extraterrestrial life, see Extr... |
Arithmetic mean
In mathematics and statistics, the arithmetic mean ( ), arithmetic average, or just the mean or average (when the context is clear) is the sum of a collection of numbers divided by the count of numbers in the collection. The collection is often a set of results from an experiment, an observational stud... |
Aberdeen (disambiguation)
Aberdeen is a city in Scotland.
Aberdeen may also refer to:
Places
Africa
Aberdeen, Sierra Leone
Aberdeen, Eastern Cape, South Africa
Asia
Hong Kong
Aberdeen, Hong Kong, an area and town on southwest Hong Kong Island
Aberdeen Channel, a channel between Ap Lei Chau (Aberdeen Island)... |
Arraignment
Arraignment is a formal reading of a criminal charging document in the presence of the defendant, to inform them of the charges against them. In response to arraignment, in some jurisdictions, the accused is expected to enter a plea; in other jurisdictions, no plea is required. Acceptable pleas vary among ... |
Ampere
The ampere ( , ; symbol: A), often shortened to amp, is the unit of electric current in the International System of Units (SI). One ampere is equal to 1 coulomb moving past a point in 1 second, or electrons' worth of charge moving past a point in 1 second. It is named after French mathematician and physicist... |
Alismatales
The Alismatales (alismatids) are an order of flowering plants including about 4,500 species. Plants assigned to this order are mostly tropical or aquatic. Some grow in fresh water, some in marine habitats. Perhaps the most important food crop in the order is the corm of the taro plant, Colocasia esculenta.... |
Asterales
Asterales () is an order of dicotyledonous flowering plants that includes the large family Asteraceae (or Compositae) known for composite flowers made of florets, and ten families related to the Asteraceae. While asterids in general are characterized by fused petals, composite flowers consisting of many flor... |
Arable land
Arable land (from the , "able to be ploughed") is any land capable of being ploughed and used to grow crops. Alternatively, for the purposes of agricultural statistics, the term often has a more precise definition:
A more concise definition appearing in the Eurostat glossary similarly refers to actual ra... |
Andrey Markov
Andrey Andreyevich Markov (14 June 1856 – 20 July 1922) was a Russian mathematician best known for his work on stochastic processes. A primary subject of his research later became known as the Markov chain. He was also a strong, close to master-level chess player.
Markov and his younger brother Vladimir... |
Demographics of Antigua and Barbuda
This article is a demography of the population of Antigua and Barbuda including population density, ethnicity, religious affiliations and other aspects of the population.
Population
According to the 2011 census the estimated resident population of Antigua and Barbuda was 86,295.
T... |
Geography of Armenia
Armenia is a landlocked country in the South Caucasus region of the Caucasus. The country spans Eastern Europe and West Asia, with cultural ties to both regions. Armenia is bordered on the north and east by Georgia and Azerbaijan and on the south and west by Iran, Azerbaijan's exclave Nakhchivan, ... |
Demographics of American Samoa
Demographics of American Samoa include population density, ethnicity, education level, health of the populace, economic status, religious affiliations and other aspects. American Samoa is an unincorporated territory of the United States located in the South Pacific Ocean.
Vital statisti... |
Algebraic number
An algebraic number is a number that is a root of a non-zero polynomial in one variable with integer (or, equivalently, rational) coefficients. For example, the golden ratio, , is an algebraic number, because it is a root of the polynomial . That is, it is a value for x for which the polynomial evalu... |
Automorphism
In mathematics, an automorphism is an isomorphism from a mathematical object to itself. It is, in some sense, a symmetry of the object, and a way of mapping the object to itself while preserving all of its structure. The set of all automorphisms of an object forms a group, called the automorphism group. I... |
Artistic revolution
Throughout history, forms of art have gone through periodic abrupt changes called artistic revolutions. Movements have come to an end to be replaced by a new movement markedly different in striking ways.
Scientific and technological
1
Not all artistic revolutions were political. Sometimes, scien... |
Arabian Prince
Kim Renard Nazel (born June 17, 1965), better known by his stage names Arabian Prince or Professor X, is an American rapper, record producer, and DJ. He was a founding member of N.W.A.
Early life
Nazel was born in Compton, California to the son of Joseph "Skippy" Nazel Jr., an African-American author a... |
Associative property
In mathematics, the associative property is a property of some binary operations, which means that rearranging the parentheses in an expression will not change the result. In propositional logic, associativity is a valid rule of replacement for expressions in logical proofs.
Within an expression ... |
Alligatoridae
The family Alligatoridae of crocodylians includes alligators, caimans and their extinct relatives.
Phylogeny
The superfamily Alligatoroidea includes all crocodilians (fossil and extant) that are more closely related to the American alligator than to either the Nile crocodile or the gharial. This is a s... |
Aare
The Aare () or Aar () is a tributary of the High Rhine and the longest river that both rises and ends entirely within Switzerland.
Its total length from its source to its junction with the Rhine comprises about , during which distance it descends , draining an area of , almost entirely within Switzerland, and ac... |
Abbotsford, Scottish Borders
Abbotsford is a historic country house in the Scottish Borders, near Galashiels, on the south bank of the River Tweed. Now open to the public, it was built as the residence of historical novelist and poet Sir Walter Scott between 1817 and 1825. It is a Category A Listed Building and the es... |
Albert the Bear
Albert the Bear (; 1100 – 18 November 1170) was the first margrave of Brandenburg from 1157 to his death and was briefly duke of Saxony between 1138 and 1142.
Life
Albert was the only son of Otto, Count of Ballenstedt, and Eilika, daughter of Magnus Billung, Duke of Saxony. He inherited his father's... |
Ahmed II
Ahmed II ( Aḥmed-i sānī) (25 February 1643 or 1 August 1642 – 6 February 1695) was the sultan of the Ottoman Empire from 1691 to 1695.
Early life
Ahmed II was born on 25 February 1643 or 1 August 1642, the son of Sultan Ibrahim and Muazzez Sultan. On 21 October 1649, Ahmed, along with his brothers Mehmed an... |
Agathon
Agathon (; ; ) was an Athenian tragic poet whose works have been lost. He is best known for his appearance in Plato's Symposium, which describes the banquet given to celebrate his obtaining a prize for his first tragedy at the Lenaia in 416. He is also a prominent character in Aristophanes' comedy the Thesmo... |
Alaric II
Alaric II (, , "ruler of all"; ; – August 507) was the King of the Visigoths from 484 until 507. He succeeded his father Euric as king of the Visigoths in Toulouse on 28 December 484; he was the great-grandson of the more famous Alaric I, who sacked Rome in 410. He established his capital at Aire-sur-l'Adou... |
Alexander of Pherae
Alexander () was Tyrant or Despot of Pherae in Thessaly, ruling from 369 to c. 356 BC. Following the assassination of Jason, the tyrant of Pherae and Tagus of Thessaly, in 370 BC, his brother Polyphron ruled for a year, but he was then poisoned by Alexander who assumed power himself. Alexander gov... |
Alexander I of Scotland
Alexander I (medieval Gaelic: Alaxandair mac Maíl Coluim; modern Gaelic: Alasdair mac Mhaol Chaluim; c. 1078 – 23 April 1124), posthumously nicknamed The Fierce, was the King of Scotland from 1107 to his death. He succeeded his brother, King Edgar, and his successor was his brother David. He wa... |
Amalasuintha
Amalasuintha (495 – 30 April 535) was a ruler of the Ostrogothic Kingdom from 526 to 535. Initially serving as regent for her son Athalaric, she became queen after his premature death. Highly educated, Amalasuintha was praised by both Cassiodorus and Procopius for her wisdom and her ability to speak thre... |
Alfonso IV of Aragon
Alfonso IV, called the Kind (also the Gentle or the Nice, ) (2 November 1299 – 24 January 1336) was King of Aragon and Count of Barcelona (as Alfons III) from 1327 to his death. His reign saw the incorporation of the County of Urgell, Duchy of Athens, and Duchy of Neopatria into the Crown of Arago... |
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