Abstract
Numerous families of simple discrete objects (words, trees, lattice walks...) are counted by a rational or algebraic generating function. Whereas it seems that objects with a rational generating function have a structure very similar to the structure of words of a regular language, objects with an algebraic generating function remain more mysterious. Some of them, of course, exhibit a clear “algebraic” structure, which recalls the structure of words of context-free languages. For many other objects, such a structure has not yet been discovered. We list several examples of this type, and discuss various methods for proving the algebraicity of a generating function.
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Bousquet-Mélou, M. (2005). Algebraic Generating Functions in Enumerative Combinatorics and Context-Free Languages. In: Diekert, V., Durand, B. (eds) STACS 2005. STACS 2005. Lecture Notes in Computer Science, vol 3404. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-31856-9_2
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