When GM tests a new car on its track field, it puts the car through its paces at different speeds. It will test how it handles a sharp curve going at 50, 60, 70 mph. To no one’s surprise, the car’s performance varies continuously with the speed. If the car passed the curve test at 50, 60, and 70 mph, then the GM engineers know—without explicit testing—that it will also pass at all the intermediate speeds of 55 and 67 mph. They don’t have to worry that at 55 mph the car will sprout wings or go into reverse. How it behaves at 55 will be some interpolated function of what it does at 50 and 60
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