30 Phil, Chapter 21, Galileo, Touchstone 53: Infinitesimal.

The infinitesimal is a form of infinity representing a theoretical value that is infinitely close to zero but not zero itself. Galileo Galilei discussed concepts related to the infinitesimal in his work “Two New Sciences”. In this work, he explored the foundations of kinematics and the strength of materials, addressing ideas that touched upon the nature of infinitely small quantities and their applications in science.