4. A computer storage medium as defined in claim 1 , wherein the anchor point of the first mathematical expression is located relative to at least one margin.
4. A computer storage medium as defined in claim 1 , wherein the anchor point of the first mathematical expression is located relative to at least one margin. 5. A computer storage medium as defined in claim 4 , wherein the anchor point is one or more from the group consisting of: left aligned relative to a first margin, right aligned relative to the second margin, and center aligned between the first margin and the second margin.