2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/46646We give a brief summary of the Gottfried sum rule and a flavor asymmetric distribution $\bar u-\bar d$ in the nucleon. First, experimental history of the sum-rule studies is discussed. Second, future prospects for studying the asymmetry at Fermilab and RHIC are discussed. We also comment on possible nuclear modification.6 pages, LATEX with epsf.sty and wrapfig.sty, 4 eps figures. Talk given at the Circum-Pan-Pacific Workshop on High Energy Spin Physics. Kobe, Japan, October 2 - 4, 1996. Complete postscript file including the figures is available at ftp://ftp.cc.saga-u.ac.jp/pub/paper/riko/quantum1 or at http://www.cc.saga-u.ac.jp/saga-u/riko/physics/quantum1/structure.htmlHigh Energy Physics - Phenomenologytext