differential and integral functions, new in version 3.0. You may want to change its name to or something like that, but then don't forget to change the links in the instruction, too.
09/06/2007 The error function erf, new in version 1.02, uses the Taylor series, which contains an infinite sum.
I decided that it's enough to count to 100 for a satisfying preciseness.
Computer graphics people would have at least one of the axes pointing in the other direction, away from you.