8.1.5 Replay

In the algebra display, an undo list is maintained for each expression. Replay displays the sequence of transformations that have been applied to the active expression up to the current point in the undo list. The sequence consists of one line per undo item that contains the resulting expression, an explanation of the transformation that produced the source, and the subject (if any) that was used by the transformation.

User-interface controls on the Replay display control the font size and inter-expression spacing.

The send-mail button ( ) serializes the replay and activates the installed email application. The serialized replay is passed along as an attachment.