VII: 03, 33-35, LNM 321 (1973) DELLACHERIE, Claude Un crible généralisé (Descriptive set theory) Given a Borel set $A$ in the product $E\times F$ of two compact metric sets, the set of all $x\in E$ such that the section $A(x)\subset Y$ is of second category is analytic Comment: The authour discovered later that the main result is in fact due to Novikov: two references are given in 1252 Keywords: Analytic sets Nature: Original Retrieve article from Numdam