Paulus Vallius (Paolo Valla, Paulus Valla, Paulus de la Valle, Paulus de Valle) (1561-1622) was an Italian Jesuit logician.
He was born in Rome.
His notes on the Posterior Analytics, generally Thomist, were used by Galileo. This occurred around 1588-1590, and it was through Vallius that Galileo learned the work of Jacopo Zabarella. It is now accepted that Vallius is the source of two logical treatises by Galileo.
He published Logica, in two volumes, at Lyon in 1622. In it he sided with Benedictus Pereyra against Giuseppe Biancani. The issue was mathematical proof in physics, where Pereyra denied mathematics an essential status.
- Corrado Dollo, Giuseppe Bentivegna, Santo Burgio, Giancarlo Magnano San Lio, Galileo Galilei e la cultura della tradizione (2003), p. 90.
- John W. O'Malley, Gauvin Alexander Bailey, Johann Bernhard Staudt, Steven J. Harris (editors), The Jesuits II: Cultures, Sciences, and the Arts, 1540-1773 (2006), p. 317 and p. 327.
- H. F. Cohen, The Scientific Revolution: A Historiographical Inquiry (1994), p. 282.
- William A. Wallace, Galileo's Pisan studies in science and philosophy, p. 32 in Peter K. Machamer, The Cambridge Companion to Galileo (1998).
- John W. O'Malley, Gauvin Alexander Bailey, T. Frank Kennedy, Steven J. Harris (editors), The Jesuits II: Cultures, Sciences, and the Arts, 1540-1773 (2006), p. 320.
- Paolo Mancosu, Philosophy of Mathematics and Mathematical Practice in the Seventeenth Century (1996), p. 13 and p. 19.