Further, some writers of the latter persuasion introduce terms with more concrete connotations (such as "relational structure" for the set-theoretic extension of a given relational concept). == History == See also: Algebraic logic#History The logician Augustus De Morgan, in work published around 1860, was the first to articulate the notion of relation in anything like its present sense.

Peirce: A Chronological Edition, Volume 2, 1867-1871.

(1870), "Description of a Notation for the Logic of Relatives, Resulting from an Amplification of the Conceptions of Boole's Calculus of Logic", Memoirs of the American Academy of Arts and Sciences 9, 317–78, 1870.

(1956/1983) Logic, Semantics, Metamathematics, Papers from 1923 to 1938, J.H.

(1956/1983) Logic, Semantics, Metamathematics, Papers from 1923 to 1938, J.H.

He also stated the first formal results in the theory of relations (on De Morgan and relations, see Merrill 1990). Charles Peirce, Gottlob Frege, Georg Cantor, Richard Dedekind and others advanced the theory of relations.

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