A complete decidable characterization of polynomial rules P yielding bilinear associative commutative P-products on series is given, together with decidability of equivalence for the associated P-automata.
and Lyndon, Roger C
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Conjecture that simple geodesics on finite modular covers have transcendental or algebraic endpoints, proved for minimal laminations.
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Commutative algebras of series
A complete decidable characterization of polynomial rules P yielding bilinear associative commutative P-products on series is given, together with decidability of equivalence for the associated P-automata.