Philosophy of Mathspeaking topic

Why did infinitesimals both work brilliantly in Newton's and Leibniz's calculus and get attacked as logically dubious 'ghosts of departed quantities'?

— infinitesimals and the foundations of calculus

practice with this topic

Set the timer (5-30 min), take 20 seconds of prep if you like, start talking. Jot your thoughts onto the sticky-note board.