He didn’t look like a revolutionary. He looked like a man who had lost a fight with a library and decided to stay there. But as he turned to the chalkboard, he didn't write a number. He wrote a relationship.
“This,” he whispered, “is the beginning of everything. It is a . It doesn't tell you the value of y . It tells you that the way y changes is tied directly to what y is at that very moment. It’s the mathematics of growth, of decay, of the way heat leaves a cup of coffee or the way a virus ripples through a city.” An Introduction to Differential Equations: With...
“Calculus taught you how to take a snapshot,” Elias concluded, setting the chalk down. “Differential Equations will teach you how to predict the storm.” He didn’t look like a revolutionary