NUCLEAR PIONS AND THE GOTTFRIED AND BJORKEN SUM-RULES

An extremely simple but instructive, ''toy'' model is presented which shows that a small excess of pions in the nucleus can produce a signif icant change in the values expected for the Gottfried sum rule. The ge neral question of the convergence of the sum rule and of the convergen ce of the experimental integral is also discussed. It is demonstrated that conclusions about the sum rule, based on deuterium data, are surp risingly model dependent. In contrast, it is stressed, that the Bjorke n sum rule can be tested significantly using deuterium data.