“There are many categories of scientists, people of second and third rank, who do their best, but do not go very far. There are also people of first class, who make great discoveries, which are of capital importance for the development of science. But then there are the geniuses, like Galilei and Newton. Well, Ettore was one of these.” – Enrico Fermi
- His Arithmeticorum libri duo (1575) includes the first known proof by mathematical induction.
- He published a methodology for measuring the earth, which was used about a hundred years later (1670) by the French astronomer Jean-Felix Picard (not Jean-Luc Picard!) to measure the meridian.
- His astronomical observations include sighting of the supernova that appeared in Cassiopeia in 1572. Tycho Brahe published details of his sighting in 1574.
- He worked on numerous ancient Greek mathematical texts, providing new and sound interpretations of Greek mathematics.
|Francesco Paolo Cantelli|