A Dichotomy Theorem for Automatic Structures

TL;DR

This paper establishes a clear dichotomy for homomorphism problems over automatic structures, showing they are either decidable in NL or undecidable, based on the property of finite duality.

Contribution

It proves a dichotomy theorem for automatic structures, characterizing when homomorphism problems are decidable or undecidable, and introduces the concept of regular homomorphisms with similar properties.

Findings

Homomorphism problems over automatic structures are either NL-decidable or undecidable.

Structures with finite duality precisely characterize the NL-decidable cases.

The same dichotomy applies to regular homomorphisms into finite structures.

Abstract

The field of constraint satisfaction problems (CSPs) studies homomorphism problems between relational structures where the target structure is fixed. Classifying the complexity of these problems has been a central quest of the field, notably when both sides are finite structures. In this paper, we study the generalization where the input is an automatic structure -- potentially infinite, but describable by finite automata. We prove a striking dichotomy: homomorphism problems over automatic structures are either decidable in non-deterministic logarithmic space (NL), or undecidable. We show that structures for which the problem is decidable are exactly those with finite duality, which is a classical property of target structures asserting that the existence of a homomorphism into them can be characterized by the absence of a finite set of obstructions in the source structure. Notably, this property precisely characterizes target structures whose homomorphism problem is definable in first-order logic, which is well-known to be decidable over automatic structures. We also consider a natural variant of the problem. While automatic structures are finitely describable, homomorphisms from them into finite structures need not be. This leads to the notion of regular homomorphism, where the homomorphism itself must be describable by finite automata. Remarkably, we prove that this variant exhibits the same dichotomy, with the same characterization for decidability.