All articles starting with R
22,461 articles
Related rights
Related rights, also called neighboring rights, are intellectual property rights granted to performers, producers of phonograms, and broadcasting organizations rather than authors, first covered internationally by the 1961 Rome Convention.
Related-party transaction
A related-party transaction is a transfer of resources, services, or obligations between a reporting entity and a related party, whether or not a price is charged.
Relation (1605 newspaper)
The Relation aller Fürnemmen und gedenckwürdigen Historien, a weekly news publication printed in Strasbourg by Johann Carolus from 1605, is generally regarded as the first printed weekly newspaper.
Relation algebra
Relation algebra is an algebraic structure whose elements represent binary relations, equipped with Boolean operations, composition, and converse; Tarski axiomatized it in 1941, building on De Morgan, Peirce, and Schröder.
Relation extraction
Relation extraction is the natural language processing task of identifying semantic relationships between entities in text, outputting structured triples that feed knowledge graphs and question answering.
Relation Therapeutics Inc.
Relation Therapeutics Inc. is an AI-driven drug-discovery biotechnology company founded in 2021, whose lead indication is osteoporosis and which partners with GSK on fibrotic diseases and osteoarthritis.
Relational algebra
Relational algebra is a procedural query language for the relational model of databases, introduced by IBM researcher Edgar F. Codd in his 1970 paper on relational data.
Relational contract
A relational contract is an informal agreement sustained not by courts but by the value of the future relationship between the parties, so it must be self-enforcing.
Relational database
A relational database stores data in tables of rows and columns and follows the relational model proposed by E. F. Codd in 1970, queried with SQL.
Relational model
The relational model, also called the relational data model, organizes database data into tables called relations, and was proposed by E. F. Codd at IBM in 1970.
Relational quantum mechanics
Relational quantum mechanics is an interpretation of quantum mechanics proposed by Carlo Rovelli in 1996, according to which different observers can give different accounts of the same events.
RelationalAI
RelationalAI is an American software company, founded in 2017 and based in Berkeley, California, whose decision intelligence platform runs a relational knowledge graph inside Snowflake.
Relationism (philosophy)
Relationism is a family of metaphysical positions on which relations are ontological primitives; about space, it holds there are only material bodies spatially related, not space itself, opposing Newton's absolutism.
Relations between Nazi Germany and the Arab world
Relations between Nazi Germany and the Arab world, 1933–1945: limited German geopolitical interest, Arabic-language propaganda and the Voice of Free Arabism, al-Husayni's collaboration, and diverse Arab responses.
Relationship between mathematics and physics
The relationship between mathematics and physics, also called the relation between physics and mathematics, is the use of mathematical structures to state physical laws and derive predictions.
Relationship between string theory and quantum field theory
The relationship between string theory and quantum field theory runs both ways: string theory was proposed to fix QFT's failure to describe quantum gravity, while AdS/CFT duality defines string theory itself through QFT.
Relationship Goals (film)
Relationship Goals (2026) is a Prime Video romantic comedy directed by Linda Mendoza, starring Kelly Rowland and Method Man, adapted from pastor Michael Todd's bestselling faith-based relationship book; released February 4, 2026, 93 minutes, PG-13, poorly reviewed (RT 24%).
Relationship marketing
Relationship marketing is the process of identifying, developing, and maintaining long-term customer exchanges to enhance performance, attributed to Leonard Berry in 1983 and defined by Morgan and Hunt's 1994 commitment-trust theory.
Relationship of Alexander Hamilton and Thomas Jefferson
Hamilton-Jefferson relationship: the rivalry between Washington's Treasury and State secretaries over debt assumption, the national bank, and the 1790 capital compromise, which created America's first party system and outlasted Hamilton's 1804 death.
Relationship of Bill Clinton and Jeffrey Epstein
Bill Clinton's relationship with Jeffrey Epstein: White House visits (1993-1995), donations, 26 flight-log legs on Epstein's jet in 2002-2003, disputed island-visit claims, denials, and the 2026 House depositions.
Relationship of Donald Trump and Jeffrey Epstein
Friendship between Donald Trump and Jeffrey Epstein: Palm Beach neighbors from the late 1980s, at least seven flights on Epstein's jet in the 1990s, a 2004 falling out, and disputed claims in the released Epstein files.
Relationship of Les Wexner and Jeffrey Epstein
The relationship of Les Wexner and Jeffrey Epstein was a financial and business association that began in the mid-1980s. Epstein became a trusted adviser to Wexner and received broad authority over his.
Relationship of Peter Mandelson and Jeffrey Epstein
Documented relationship between Peter Mandelson and Jeffrey Epstein, 2002–2016: 100+ emails, birthday-book tribute, alleged payments, 2009 townhouse stay, and Mandelson's 2025 dismissal as UK ambassador to the US.
Relationship of Prince Andrew and Jeffrey Epstein
The friendship between Prince Andrew (Andrew Mountbatten-Windsor), Duke of York, and Jeffrey Epstein: met via Ghislaine Maxwell around 1999, contact continued past Epstein's 2008 conviction, Giuffre's 2021 lawsuit settled in 2022, and Andrew lost all titles in 2025.
Relative afferent pupillary defects
Relative afferent pupillary defects (RAPD), also called Marcus Gunn pupil, is an asymmetry in the afferent sensory limb of the pupillary light reflex caused by disease.
Relative atomic mass
Relative atomic mass, formerly called atomic weight, is the dimensionless ratio of an element's average atomic mass to one twelfth of a carbon-12 atom's mass, about 35.45 for chlorine.
Relative biological effectiveness
Relative biological effectiveness (RBE) is a unitless quantity in radiobiology, defined as the ratio of reference-radiation dose to test-radiation dose producing the same biological effect.
Relative Citation Ratio
The Relative Citation Ratio (RCR) is a field- and time-normalized citation metric developed at the NIH, where 1.0 equals the median funded paper's citation rate.
Relative clause
Relative clause: a subordinate clause modifying a noun or noun phrase, also called a relativization construction. Covers restrictive vs non-restrictive types, WALS word-order typology (579 postnominal of 824 languages), English relativizer history, and LLM attachment processing.
Relative configuration
Relative configuration is the configuration of any stereogenic center with respect to another in the same molecule; a molecule and its mirror image share it.