I presented "Visualizing an Accumulation Function" at the contributed paper session Effective Use of Dynamic Mathematical Software in the Classroom for MathFest '09 in Portland, OR.

text versions of the files are provided for those who wish to implement the ideas in another computer algebra system. The full computer animation is available in the Mathematica version; a snapshot is seen in the html version.

Example #	Mathematica files	html version
1	AccEx1.nb	AccEx1.html
2	AccEx2.nb	AccEx2.html
3	AccEx3.nb	AccEx3.html
4	AccEx4.nb	AccEx4.html