A bijection between a subclass of appending streaming string transducers and bimachines enables Ptime register minimization and NP minimization for states and registers, extended via asynchronous bimachines to prove NP-completeness of register minimization with fixed underlying automaton.
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Minimizing Streaming String Transducers: An algebraic approach
A bijection between a subclass of appending streaming string transducers and bimachines enables Ptime register minimization and NP minimization for states and registers, extended via asynchronous bimachines to prove NP-completeness of register minimization with fixed underlying automaton.