Resultant and conductor of geometrically semi-stable self maps of the projective line over a number field or function field - Szpiro, Lucien (CUNY Graduate Center (Nova York, Estats Units d'Amèrica)) ; Tepper, Michael (Penn State Abington. Division of Science and Engineering (Abington, Estats Units d'Amèrica)) ; Williams, Phillip (The King's College (Nova York, Estats Units d'Amèrica))