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Aristotle University of Thessaloniki (Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης)
Aristotle University of Thessaloniki (Αριστοτέλειο Πανεπιστήμιο Θεσσαλονίκης), also known as University of Thessaloniki, is the largest public university in Greece. It was founded in 1925 and opened in 1926.
Aristotle's biology
Aristotle's biology: the systematic, empirical zoological research of Aristotle (384–322 BCE) in History of Animals, Parts of Animals, and Generation of Animals, the first comprehensive study of life, using historia-then-causes method and teleological explanation.
Aristu Jah
Aristu Jah (ارسطو جاہ) was the diwan, or chief minister, of Hyderabad under Nizam Ali Khan, holding office from 1778 to 1795 until his death in 1804.
Arita ware
Imari ware (伊万里焼, Imari-yaki), also called Arita or Hizen ware, is Japan's first porcelain, made around Arita, Saga, and shipped from Imari port. Known for Early Imari, Kakiemon, Kinrande, and Nabeshima styles and 17th-century VOC exports to Europe.
Arithmetic
Arithmetic is the branch of mathematics that studies numbers and their operations, chiefly addition, subtraction, multiplication, and division, with roots going back to ancient Egypt.
Arithmetic coding
Arithmetic coding is a lossless data compression method that represents an entire message as a subinterval between 0 and 1, achieving better compression than Huffman coding at higher computational cost.
Arithmetic combinatorics
Arithmetic combinatorics, also called additive combinatorics, is a branch of mathematics at the intersection of combinatorics and number theory that studies sets under addition and multiplication.
Arithmetic dynamics
Arithmetic dynamics is a branch of mathematics, established around 2000 by Joseph H. Silverman, that reformulates number theory problems as questions about iterated rational maps.
Arithmetic group
An arithmetic group is a group of integer matrices arising as the integer points of a linear algebraic group over the rationals, with SL(n, Z) the prototype.
Arithmetic logic unit
An arithmetic logic unit (ALU) is a digital circuit within a CPU or GPU's execution unit that performs arithmetic and bitwise logical operations on binary data.
Arithmetic mean
The arithmetic mean, the usual average, is the sum of a set of numbers divided by how many numbers there are, a central measure in statistics.
Arithmetic of abelian varieties
The arithmetic of abelian varieties is the branch of arithmetic geometry studying rational points, torsion, and L-functions of abelian varieties, centered on the Mordell–Weil finiteness theorem.
Arithmetic optimization algorithm
The arithmetic optimization algorithm (AOA) is a population-based, derivative-free metaheuristic introduced by Laith Abualigah and colleagues in 2021 that searches for global optima using arithmetic operators as search operators.
Arithmetic progression
An arithmetic progression, also called an arithmetic sequence, is a sequence of numbers in which consecutive terms differ by a constant, the common difference; its nth term is a + (n − 1)d.
Arithmetic topology
Arithmetic topology is a branch of mathematics studying the analogy that knots are like prime numbers and 3-manifolds are like number rings, named in the mid-1990s.
Arithmetic-geometric mean
The arithmetic-geometric mean is the common limit reached by repeatedly taking the arithmetic and geometric means of two numbers, converging quadratically and underlying the fastest known algorithms for computing π.
Arithmetical hierarchy
The arithmetical hierarchy, also called the Kleene or Kleene–Mostowski hierarchy, classifies sets of natural numbers into levels Σₙ and Πₙ by quantifier alternations, developed by Kleene and Mostowski in the 1940s.
Arithmetical set
An arithmetical set is a set of natural numbers definable by a first-order formula over addition and multiplication, belonging to some level of the arithmetical hierarchy introduced by Kleene in 1943.
Arity
Arity, also called adicity, is the number of arguments that a function or predicate takes, chiefly in mathematical logic and programming; standard names include unary, binary, ternary, and n-ary.
Aritz Aduriz
Aritz Aduriz Zubeldia, born 1981 in San Sebastián, is a Spanish retired center-forward who left Athletic Club in 2020 as its top 21st-century scorer, with 172 goals.
Aritzia
Aritzia is a Canadian women's fashion retailer founded in Vancouver in 1984 by Brian Hill, selling exclusive in-house brands and trading on the Toronto Stock Exchange.
Arius (Ἄρειος)
Arius (Ἄρειος) was an Alexandrian presbyter whose teaching that the Son is a created being provoked the Arian controversy and the Council of Nicaea in 325.
Ariwara no Narihira
Ariwara no Narihira (825–880) was a Japanese waka poet of the early Heian period, one of the Six Poetic Immortals and the presumed hero of the Tales of Ise.
Ariwara no Yukihira
Ariwara no Yukihira (在原行平, 818–893) was a Japanese court noble and waka poet of the early Heian period, elder brother of the poet Ariwara no Narihira.
Ariya Daivari
Ariya Daivari, 'The Persian Lion', Iranian-American wrestler born 1989; WWE 205 Live and Cruiserweight Classic 2016, now leads The Premier Athletes with Tony Nese in AEW and Ring of Honor.
Ariyamuni
Ariyamuni, in Thai พระอริยมุนี, was a Siamese Buddhist monk who served as deputy to Upali in the 1753 mission from Ayutthaya to Kandy that restored Buddhist higher ordination in Sri Lanka.
Ariyanatha Mudaliar
Ariyanatha Mudaliar (அரியநாத முதலியார்) was chief minister and commander-in-chief of the sixteenth-century Madurai Nayak kingdom under Visvanatha Nayak, credited with organizing its poligar system of territorial administration.
Ariyon Bakare
Ariyon Bakare (born 1971) is a British actor, writer, and director from London's East End, known for Doctors, Jonathan Strange & Mr Norrell, His Dark Materials, Life, and his 2025 BAFTA-winning role as Morris in Mr Loverman.
Ariz-i Mumalik
The Ariz-i Mumalik (عارض ممالک) headed the diwan-i arz, the military department of the Delhi Sultanate, overseeing recruitment, pay, and reviews; under the Mughals its functions passed to the mir-bakhshi.
Arize AI
Arize AI: AI observability and LLM evaluation platform founded 2020 by Jason Lopatecki and Aparna Dhinakaran; products Arize AX, Phoenix, OpenInference; raised $131M, acquired by Dynatrace for $915M in 2026.