In calculus, the derivative of a function can be interpreted as the instantaneous slope of that function’s graph at any point. Students spend the better part of a year in calculus class learning how ...

As the name implies, the derivimeter finds the derivative of a function. To do that, you have to plot the function on a piece of paper that the meter can measure.

On a graph, subtracting the values of connected points is the appropriate analog of taking a derivative, which is, after all, the difference of two values infinitely close together. And given that, ...