often speak as if our mathematical equations are out there in the world, relentlessly controlling all physical processes, quarks to the cosmos. That may be the case. Perhaps we will one day establish that mathematics is fundamentally stitched into the tapestry of reality. When you work with the equations day in and day out it surely feels that way. However, I am more confident in asserting that nature is lawful—that the universe is made of ingredients whose behaviors follow a lawful progression—the very basis of the journey we have taken in this book.
