Main conjecture on computable functions on the space of marked groups

From papers

Let GWP\mathcal{G}_{WP} be the space of marked groups with solvable word problem, equipped with its computability structure, and let ΛWP\Lambda_{WP} denote the corresponding representation. A function is ΛWP\Lambda_{WP}-computable when it is computable relative to this representation; a recursive metric space is a metric space with effective computable structure.

Main conjecture. Any ΛWP\Lambda_{WP}-computable function defined on GWP\mathcal{G}_{WP}, with image in any recursive metric space, is continuous.

The paper explains that standard effective continuity theorems do not apply to GWP\mathcal{G}_{WP}, while known examples of computable discontinuous functions on recursive metric spaces are pathological. Whether every computable function in this setting is continuous remains open.

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Sources & referencesView supporting material

Primary source

Emmanuel Rauzy, “Computable analysis on the space of marked groups”, arXiv:2111.01179 (2025).

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