# Upper and Lower Sum

- Author:
- Sara Hinterplattner

- Show the graph, the lower sum L, the upper sum U and the integral S in the interval [a;b] by selecting the marble next to them.
- Use the sliders in order to change the values of the interval [a;b] and the count of the rectangles for the lower and upper sum and explore how they are influencing the difference between the sums.