Example Draw the graph of y = x 2 x 4 and use it to find the roots of the equation to 1 decimal place. Draw and complete a table of values to find coordinates of points on the graph.

But Tatsuo Horiuchi, a 74-year-old man from an area in Japan called Nagano Prefecture, has discovered how to make stunning works of art using Excel spreadsheets.

Examples include finite graphs, periodic graphs, graphings, and percolation graphs. Making use of Connes’s noncommutative integration theory, we construct a zeta function and present a determinant ...