To download the book, press the button on the left. A self-extracting file will be downloaded. This places the book, along with its documentation, on the Start, Programs, Mathwright Library menu, so that you may read it whenever you like. Two fundamental ideas of calculus, the limit and the derivative, are explored visually in an activity of successively zooming in on one point of a graph. If the graph eventually becomes a straight line, the derivative is the slope of that line.
Students control the zooming in process and measure the slope geometrically.
Similarly, the idea of the limit is explored by zooming in on the graph of a function over a punctured interval.