%A"Sezgin, E" %D1991 %I; International Centre for Theoretical Physics (ICTP), Trieste (Italy) %2 %J[] %K71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS, ALGEBRA, SUPERSYMMETRY, LAGRANGIAN FIELD THEORY, GRAVITATION, 661100, CLASSICAL AND QUANTUM MECHANICS %PMedium: X; Size: 24 p. %TAspects of W{sub {infinity}} symmetry %XWe review the structure of W{sub {infinity}} algebras, their super and topological extensions, and their contractions down to (super) w{sub {infinity}}. Emphasis is put on the field theoretic realizations of these algebras. We also review the structure of w{sub {infinity}} and W{sub {infinity}} gravities and comment on various applications of W{sub {infinity}} symmetry. (author). 42 refs. %0Technical Report %NIC-91/206; CTP-TAMU-9/91.;Other: ON: DE92609096; CNN: Grant PHY-8907887; TRN: XA9129682081608 %1 %CIAEA %Rhttps://doi.org/ Other: ON: DE92609096; CNN: Grant PHY-8907887; TRN: XA9129682081608 INIS %GEnglish