-Expressions are handles to other more fundamental objects, that many
-times contain other expressions thus creating a tree of expressions
+Expressions are handles to other more fundamental objects, that often
+contain other expressions thus creating a tree of expressions
(@xref{Internal Structures}, for particular examples). Most methods on
@code{ex} therefore run top-down through such an expression tree. For
example, the method @code{has()} scans recursively for occurrences of
(@xref{Internal Structures}, for particular examples). Most methods on
@code{ex} therefore run top-down through such an expression tree. For
example, the method @code{has()} scans recursively for occurrences of
GiNaC header files. This method is however only to be used internally by
GiNaC to establish a canonical sort order for terms, and using it to compare
expressions will give very surprising results.
GiNaC header files. This method is however only to be used internally by
GiNaC to establish a canonical sort order for terms, and using it to compare
expressions will give very surprising results.