Functions
Limits
Derivatives and differentiation
Optimization
Integrals and Integration
means that in computing quantity S (area, length, volume, time, dollars, etc.) we simply add up lots of tiny amounts (infinitesimals) of S. Examples:
where v(x) is the average automobile velocity at every point along the road from point a to point b. (dt was calculated using the DiRT formula - don't forget the dirt formula!).