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logic
(Encyclopedia) logic, the systematic study of valid inference. A distinction is drawn between logical validity and truth. Validity merely refers to formal properties of the process of inference. Thus…Plato
(Encyclopedia) PlatoPlatoplāˈtō [key], 427?–347 b.c., Greek philosopher. Plato's teachings have been among the most influential in the history of Western civilization. Many of the late dialogues…numeral
(Encyclopedia) numeral, symbol denoting anumber. The symbol is a member of a family of marks, such as letters, figures, or words, which alone or in a group represent the members of a numeration…elephant
(Encyclopedia) elephant, largest living land mammal, found in tropical regions of Africa and Asia. Elephants have massive bodies and heads, thick, pillarlike legs, and broad, short padded feet, with…relativity
(Encyclopedia) relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of…Federalist party
(Encyclopedia) Federalist party, in U.S. history, the political faction that favored a strong federal government. Opposition to war brought the Federalists the support of Clinton and many others,…still life
(Encyclopedia) still life, a pictorial representation of inanimate objects. The term derives from the 17th-century Dutch still-leven, meaning a motionless natural object or objects. In East Asia…motion picture photography
(Encyclopedia) motion picture photography or cinematography, photographic arts and techniques involved in making motion pictures. See also photography, still. Cinematography developed as a…Afroasiatic languages
(Encyclopedia) Afroasiatic languagesAfroasiatic languagesăfˌrōāˌzhēătˈĭk [key], formerly Hamito-Semitic languagesHamito-Semitic languageshămˈĭtō-səmĭtˈĭk [key], family of languages spoken by more…formula, in chemistry
(Encyclopedia) formula, in chemistry, an expression showing the chemical composition of a compound. Formulas of compounds are used in writing the equations (see chemical equations) that represent…Trending
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