Mathematics workbook graphical user interface, apparatus for providing the interface, and a network system of devices storing the interface

摘要

The interface displays a portion of the workbook page and receives user input, particularly via a touchscreen. An input location of the user input relative to the displayed page is determined, particularly as a cell 35 in a grid 31, and a content type, particularly a character, a file shading, a drawing fragment, a line element, or a plotting point, is associated with the input and the user input is correspondingly stored as content data associated with the data type. Also claimed is apparatus for displaying the interface and a plurality of cell elements configured to store components of a mathematical expression or Cartesian graph. Also claimed is a system of electronic devices in a network, each device storing a data structure associated with a two-dimensional grid of an emulated mathematical workbook page.