Um Erro Com Um Seculo
Un manoscritto inedito in francese di Ettore Majorana
Una controversia historica al servicio de una situacion de aprendizaje: una reconstruccion didactica basada en Dialogo sobre los dos maximos sistemas del mundo de Galileo
Una lezione particolare di Ettore Majorana
Uncertainty and the Communication of Time
Unification and Emergence in Physics: the Problem of Articulation
Unitary theories in the work of Mira Fernandes (beyond general relativity and differential geometry)
Unity, Disunity and Pluralism in Science
Unpublished opening lecture for the course on the theory of relativity in Argentina, 1925
Use of Hamilton's canonical equations to rectify Newton's corpuscular theory of light: A missed opportunity