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A note on commutative multivariate rational series |
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| 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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