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A note on commutative multivariate rational series
Authors:B. Litow
Affiliation:School of Information Technology, James Cook University, Townsville, Qld. 4811, Australia
Abstract:Direct arguments are presented showing that for rational series in several commuting variables, the rational series problem is undecidable, and closure under Hadamard product fails.
Keywords:Formal languages   Formal rational series   Hadamard product   Computability
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