All articles starting with R
22,461 articles
Recurrent neural network channel decoder
A recurrent neural network channel decoder is a neural network that recovers transmitted information bits from noisy channel outputs by reusing the same weights across decoding iterations.
Recurrent neural network wave functions
Recurrent neural network wave functions are variational ansatz representing quantum many-body wave functions with recurrent neural networks, introduced in 2020 and optimized by variational Monte Carlo to find ground states.
Recurrent nova
A recurrent nova is a cataclysmic binary system containing a white dwarf that undergoes nova eruptions more than once, with recurrence times of about 1 to 100 years.
Recurrent pericarditis
Recurrent pericarditis is the return of pericardial inflammation after a symptom-free interval of 4 to 6 weeks or longer, affecting 15 to 30% of patients after a first episode.
Recurrent pregnancy loss
Recurrent pregnancy loss (RPL), or recurrent miscarriage, is two or more spontaneous pregnancy losses before about 20-22 weeks, excluding molar and ectopic pregnancies; about half stem from embryonic aneuploidy, and most cases are unexplained.
Recurring character
A recurring character is a fictional character who appears repeatedly across a series' installments without belonging to its regular cast, as distinct from a main character.
Recurring deposit
A recurring deposit is a term deposit in which a saver deposits a fixed sum monthly for a fixed tenure, earning fixed interest paid at maturity.
Recurring Saturday Night Live characters and sketches introduced 1995–96
Recurring Saturday Night Live characters and sketches introduced 1995–96 covers season 21 (September 30, 1995–May 18, 1996) debuts including Get Off the Shed!, Leg Up, Nightline, Spade in America, Mary Katherine Gallagher, and the Spartan Cheerleaders, created during the show's major post-season-20 cast rebuild.
Recurring slope lineae
Recurring slope lineae (RSL) are narrow dark streaks on steep Martian slopes that lengthen in warm seasons and fade, first reported in 2011 from HiRISE images.
Recurring township names in the United States
Recurring township names in the United States are the repeated use of one name, like Washington or Franklin, for separate townships in different counties and states.
Recursion
Recursion, also called recursivity, is the process of defining or solving something in terms of smaller instances of itself, as when a function invokes itself on simpler sub-problems.
Recursion (computer science)
Recursion in computer science is a method of solving a problem in which a function calls itself on a smaller version of the same problem, ending at a base case.
Recursion (Crouch novel)
Recursion (2019) is a science fiction thriller by Blake Crouch, published by Crown, about NYPD detective Barry Sutton and neuroscientist Helena Smith confronting False Memory Syndrome and memory-editing technology; Netflix rights held by Shondaland and Matt Reeves.
Recursion Pharmaceuticals
Recursion Pharmaceuticals is a clinical-stage biotech company using automation and AI for drug discovery, founded in Salt Lake City, Utah, in 2013 and public on Nasdaq since 2021.
Recursion theorem (Dedekind)
The Dedekind recursion theorem, proved by Richard Dedekind in 1888, guarantees that a function defined by recursion on the natural numbers exists and is unique.
Recursion theorem fixed point
In computability theory, a recursion theorem fixed point is a program index n with the same partial function as its transform, φn = φf(n), guaranteed by Kleene's second recursion theorem.
Recursive acronym
A recursive acronym, also called a self-referential or circular acronym, is an acronym that refers to itself, a hacker tradition best known through GNU, "GNU's Not Unix!"
Recursive Bayesian estimation
Recursive Bayesian estimation, also known as Bayesian or Bayes filtering, sequentially estimates a system's hidden state through prediction and update steps, with the Kalman and particle filters as best-known forms.
Recursive descent parser
Recursive descent parser: a hand-written top-down (LL) parsing method with one procedure per grammar nonterminal, requiring removal of left recursion and common prefixes; predictive variants run in linear time and are used in GCC, Clang, V8, and Roslyn.
Recursive filtering
A recursive filter computes each output from the current measurement and the previous estimate, matching full-history accuracy with fixed cost, as in IIR filters and the Kalman filter.
Recursive language
A recursive language, also known as a decidable or Turing-decidable language, is a formal language decidable by a Turing machine that halts on every input, finite or not.
Recursive largest first algorithm
The recursive largest first algorithm is a greedy graph coloring heuristic, introduced by Frank Leighton in 1979, that builds each color class as an independent set.
Recursive least squares filter
The recursive least squares (RLS) filter, or RLS algorithm, is an adaptive filter that recursively minimizes weighted squared error, converging faster than LMS at higher computational cost per step.
Recursive neural network
A recursive neural network is a neural architecture that applies the same composition function recursively over structured inputs such as parse trees, producing hierarchical vector representations used in natural language processing.
Recursive Newton–Euler algorithm
The recursive Newton–Euler algorithm (RNEA) computes a robot's inverse dynamics: given joint positions, velocities, and accelerations, it calculates the required joint forces and torques in linear time.
Recursive partitioning
Recursive partitioning is a statistical method that builds classification and regression models by repeatedly splitting a dataset into smaller subgroups, producing a binary tree whose leaves carry predictions.
Recursive reward modeling
Recursive reward modeling (RRM) is an AI alignment method proposed by Jan Leike and colleagues at DeepMind in 2018, in which AI agents help humans evaluate more capable agents.
Recursive self-improvement
Recursive self-improvement, also known as Seed AI, is a proposed capability in which an AI autonomously designs and develops its own successor; it has not yet been achieved.
Recursive Superintelligence
Recursive Superintelligence, branded Recursive, is a frontier AI startup in San Francisco and London founded by Richard Socher, launched in May 2026 with $650 million in funding.
Recursively enumerable language
A recursively enumerable language, also called a Turing-recognizable language, is a formal language accepted by some Turing machine, which may run forever on strings outside it.