Geometric Combinatorics Combinatorial Reciprocity Theorems 4 Rational Generating Functions The sets \((M)\), \((\gamma)\), \((\Delta)\), and \((h^*)\) are bases for the vector space \(\mathbb{C}[x]_{\le d} := \{\,f \in \mathbb{C}[x] : \deg(f)\le d\,\}.\)