The tool on this page allows you to study several examples of rings of order 4. After pressing the button below, you will be offered a choice of six different rings. After a ring is selected, you will see both its addition and multiplication tables.
Among these six rings, there are examples of isomorphic rings. To
explore this idea, you may reconfigure the diagrams somewhat. For
instance, when the Move button is pressed, you will be able to
change the order in which elements are presented by clicking and
dragging a particular element in the top or left side of a table. You
may change the color of an element by pressing the Edit button
and then clicking on the element (again, in either the top or left
side of a table) you wish to change.