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arXiv · 2203.16298

Algebraic properties of the first-order part of a problem

Giovanni Solda·Manlio Valenti
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Abstract

In this paper we study the notion of first-order part of a computational problem, first introduced by Dzhafarov, Solomon, and Yokoyama, which captures the "strongest computational problem with codomain $\mathbb{N}$ that is Weihrauch reducible to $f$". This operator is very useful to prove separation results, especially at the higher levels of the Weihrauch lattice. We explore the first-order part in relation with several other operators already known in the literature. We also introduce a new operator, called unbounded finite parallelization, which plays an important role in characterizing the first-order part of parallelizable problems. We show how the obtained results can be used to explicitly characterize the first-order part of several known problems.

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Giovanni Solda, Manlio Valenti. 2022-03-30. Algebraic properties of the first-order part of a problem. https://doi.org/10.1016/j.apal.2023.103270

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