Creates a Maxima Set {...}
s=symSet(a_1,[a_2,[...]])
can be of type int, double, complex, string, sym, polynomial
is of type sym
The function symSet makes a set with elements a_1,...
Syms(['a' 'b' 'c' 'd' 'e']) A=symSet(a,b,d,e) B=symSet(c,b,e) union(A,B) intersect(A,B)