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Asymptotic theory (statistics)
Asymptotic theory, also called large sample theory, is the branch of mathematical statistics describing how estimators and tests behave as sample size grows without bound.
Asymptotic theory of M-estimators
The asymptotic theory of M-estimators studies estimators defined by maximizing a criterion, such as maximum likelihood and sample quantiles, giving conditions for consistency, root-n rates, and asymptotic normality.
Asymptotic theory of the bootstrap
The asymptotic theory of the bootstrap studies when and why resampling approximations to sampling distributions converge to correct limits as sample size grows, and at what rate.
Asymptotic-safety predictions and critical exponents
Asymptotic-safety predictions and critical exponents are the testable outputs of the Reuter fixed point in quantum gravity, including ν ≈ 1/3 for Newton's constant and a microscopic spectral dimension of 2.
AsyncAPI
AsyncAPI is an open-source, protocol-agnostic specification under the Linux Foundation for describing event-driven and message-driven APIs; created in 2016 by Fran Méndez, sister to OpenAPI, latest version 3.1.0.
Asynchronous design
Asynchronous design is a digital circuit design style that replaces the global clock with local request-acknowledge handshaking, saving power and demonstrated by the Amulet ARM processors at the University of Manchester.
Asynchronous optical sampling
Asynchronous optical sampling (ASOPS) is a pump–probe technique in ultrafast spectroscopy that scans the delay between pulses using two mode-locked lasers at slightly different repetition rates.
Asynchronous stochastic gradient descent
Asynchronous stochastic gradient descent, or Async SGD, is a distributed training scheme where workers update a shared model without waiting for each other, trading synchronization for stale gradients.
Asynchronous Transfer Mode
Asynchronous Transfer Mode (ATM) is a broadband networking technology that carries voice, video, and data in 53-byte cells, chosen by the CCITT in 1986 as the foundation of Broadband ISDN.
Asystole
Asystole (cardiac standstill, flatline) is the absence of cardiac electrical activity on ECG during cardiac arrest. A nonshockable rhythm with PEA; treated with CPR and early epinephrine, not defibrillation or pacing.
Asyut
Asyut, also known as Assiut or ancient Siut, is a city on the western Nile in Middle Egypt, occupied since the Old Kingdom and capital of a Upper Egyptian nome.
Asyut Governorate
Asyut Governorate (محافظة أسيوط), Upper Egypt governorate on the Nile with capital Asyut; area 25,926 km², 5.25 million people (2025), cement and food industries, Asyut University, high poverty rate.
Asyut Project coffins
The Asyut Project coffins, or Asyut coffins, are inscribed wooden coffins from the necropolis of Asyut in Middle Egypt, dating from the late 6th Dynasty to the end of the 12th.
Asyut stelae of the nomarchs
The Asyut stelae of the nomarchs, also called the Siut Stelae, are autobiographical inscriptions in the tombs of Asyut's governors, recording the city's wars against Thebes in the 21st century BCE.
AT (form factor)
The AT form factor, introduced by IBM with the PC AT in August 1984, was the first motherboard standard for PC-compatible computers; its Baby AT variant dominated until Intel's ATX arrived in 1995.
AT 2017gfo
AT2017gfo, also known as SSS17a, is the kilonova that accompanied the binary neutron star merger GW170817 in 2017, the first electromagnetic counterpart of a gravitational-wave source, observed in galaxy NGC 4993.
AT 2018cow
AT 2018cow, nicknamed "the Cow," is a luminous fast blue optical transient discovered on 16 June 2018 in the spiral galaxy CGCG 137-068, about 200 million light-years away in Hercules.
AT 2019qiz
AT 2019qiz is a tidal disruption event, a star torn apart by a supermassive black hole, discovered by the Zwicky Transient Facility in September 2019 at about 215 million light-years.
At Cafe 6 (六弄咖啡馆)
At Cafe 6 (六弄咖啡馆) is a 2016 Taiwanese romance drama directed by Wu Tzu-yun (Fujii Shu), adapted from his own novel, starring Dong Zijian and Cherry Ngan; Austin Lin won the 53rd Golden Horse Best Supporting Actor, and it grossed NT$68.5 million in Taiwan.
At Close Range
At Close Range is a 1986 American crime drama directed by James Foley, starring Sean Penn and Christopher Walken as estranged son and father, based on the Bruce Johnston Sr. crime family of Pennsylvania.
At Eighteen (열여덟의 순간)
At Eighteen (열여덟의 순간, Moment of Eighteen) is a 2019 JTBC coming-of-age drama, 16 episodes, July 22–September 10, 2019, directed by Sim Na-Yeon, written by Yoon Kyung-Ah, starring Ong Seong-Wu, Kim Hyang-Gi, and Shin Seung-Ho as three eighteen-year-old students.
At Eternity's Gate
At Eternity's Gate, also titled Sorrowing Old Man, is Vincent van Gogh's May 1890 oil painting of a despairing old man, painted at the Saint-Rémy asylum from his 1882 lithograph Worn Out, now in the Kröller-Müller Museum.
At Eternity's Gate (film)
At Eternity's Gate (2018), Julian Schnabel's drama starring Willem Dafoe as Vincent van Gogh in his final years. Venice premiere, Volpi Cup and Oscar-nominated performance; ends with the contested René Secrétan shooting theory.
At Fifteen I Went to War
At Fifteen I Went to War (Shiwu congjun zheng) is an anonymous Han yuefu folk poem about a soldier who leaves home at fifteen and returns at eighty.
At Fillmore East
At Fillmore East is the Allman Brothers Band's 1971 double live album, recorded March 12–13, 1971 at Bill Graham's Fillmore East, produced by Tom Dowd; seven tracks, No. 13 Billboard, gold, National Recording Registry.
At Five in the Afternoon
At Five in the Afternoon (Panj-e asr) is a 2003 Iran-France drama by Samira Makhmalbaf about Noqreh, an Afghan girl secretly attending school and dreaming of becoming president; it won the Jury Prize at Cannes 2003.
At Folsom Prison
At Folsom Prison (aka Johnny Cash At Folsom Prison) is Johnny Cash's live album recorded January 13, 1968 at Folsom State Prison, produced by Bob Johnston, released 1968 as Columbia CS 9639; peaked at number 13 Billboard, gold in 1968.
At Kinosaki
At Kinosaki (城の崎にて, Kinosaki nite) is a 1917 short story by Shiga Naoya based on his own convalescence, where the narrator concludes that life and death are not opposites.
At Last
"At Last" is a 1941 song by Mack Gordon and Harry Warren, written for Sun Valley Serenade and first hit by Glenn Miller (Billboard #2, 1942), whose definitive version is Etta James's 1961 recording on Chess/Argo.
At Long Last Love
At Long Last Love (1975) is Peter Bogdanovich's Cole Porter jukebox musical starring Burt Reynolds, Cybill Shepherd, Madeline Kahn, and Duilio Del Prete, a Radio City Music Hall flop with multiple competing cuts and a later reappraisal.