Liu, Yanpei Combinatorial functional equations. (Chinese. English summary) Zbl 0942.05002 Appl. Math., Ser. A (Chin. Ed.) 14, No. 4, 369-396 (1999). Summary: The purpose of this article is to introduce a number of functional equations. Some are solved and others unsolved yet. A solution of one of them would much influence the development of not only combinatorics but also the theory of functional equations. MSC: 05A15 Exact enumeration problems, generating functions 05A40 Umbral calculus 05C30 Enumeration in graph theory 12H10 Difference algebra 14E25 Embeddings in algebraic geometry 30B10 Power series (including lacunary series) in one complex variable 39B42 Matrix and operator functional equations 47A60 Functional calculus for linear operators Keywords:number of functional equations PDFBibTeX XMLCite \textit{Y. Liu}, Appl. Math., Ser. A (Chin. Ed.) 14, No. 4, 369--396 (1999; Zbl 0942.05002)