I know of just two editions of SGA 4. Does anyone here know of others? There is the well known one by Springer, where SGA 4 gets three volumes. It came out after Lawvere and Tierney had axiomatized elementary toposes. Before that, there was an edition published by the IHES with no publication date titled: INSTITUT DES HAUTES ETUDES SCIENTIFIQUES SEMINAIRE DE GEOMETRIE ALGEBRIQUE 1963-64 COHOMOLOGIE ETALE DES SCHEMAS par Michael Artin et Alexander Grothendieck Fascicule 1 par Jean-Louis Verdier This volume consists of an "Avant-Propos" plus six exposes by Verdier: "Topologies et Faisceaux" I-IV, plus "Cohomologie etale des schemas" and "Etude des limites". The Avant-Propos describes the contents of later volumes, but I don't know if they ever appeared in this form. No doubt some notes circulated in some places even before that. Did anyone here see such notes? Does anyone here know of other editions of the whole? thanks, Colin 13-Sep-2001 17:57:05 -0300,6406;000000000000-00000012