A polynomial of several variables can be represented in different ways:
A monomial with several variables is represented by a coefficient and a list of integers (interpreted as powers of a variable list). The delimiters for monomials are %%%{ and %%%}.
For example, 3x2y is represented by %%%{3,[2,1]%%%} with respect to the variable list [x,y], and 2x3y2z−5 xz is represented by %%%{2,[3,2,1]%%%}-%%%{5,[1,0,1]%%%} with respect to the variable list [x,y,z].
For a sparse representation, a single variable polynomial can be regarded as a multivariate polynomial with one variable.