.RB ( ' )
around the name, as demonstrated for the "unassign" command above.
.PP
+Symbols are considered to be in the complex domain by default, i.e. they are
+treated as if they stand in for complex numbers. This behavior can be changed
+by using the keywords
+.BI real_symbols
+and
+.BI complex_symbols
+and affects all newly created symbols.
+.PP
The following symbols are pre-defined constants that cannot be assigned
a value by the user:
.RS
Alexander Frink <Alexander.Frink@uni-mainz.de>
.br
Richard Kreckel <Richard.Kreckel@uni-mainz.de>
+.br
+Jens Vollinga <vollinga@thep.physik.uni-mainz.de>
.SH SEE ALSO
GiNaC Tutorial \- An open framework for symbolic computation within the
C++ programming language