2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/69697We collect a number of open questions concerning Diophantine equations, Diophantine Approximation and transcendental numbers. Revised version: corrected typos and added references.58 pages. to appear in the Moscow Mathematical Journal vo. 4 N.1 (2004) dedicated to Pierre CartierNumber Theory11Jtext