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Paper:

TR24-126 | 17th June 2024 14:37

On the Complexity of Some Restricted Variants of Quotient Pigeon and a Weaker Variant of König

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TR24-126
Authors: Takashi Ishizuka
Publication: 4th August 2024 08:55
Downloads: 164
Keywords: 


Abstract:

One of the most famous TFNP subclasses is PPP, which is the set of all search problems whose totality is guaranteed by the pigeonhole principle. The author's recent preprint [ECCC TR24-002 2024] has introduced a TFNP problem related to the pigeonhole principle over a quotient set, called Quotient Pigeon, and shown that the problem Quotient Pigeon is not only PPP-hard but also PLS-hard. In this paper, we formulate other computational problems related to the pigeonhole principle over a quotient set via an explicit representation of the equivalence classes. Our new formulation introduces a non-trivial PPP$\cap$PPA$_k$-complete problem for some $k \ge 2$. Furthermore, we consider the computational complexity of a computational problem related to König's lemma, which is a weaker variant of the problem formulated by Pasarkar, Papadimitriou, and Yannakakis [ITCS 2023]. We show that our weaker variant is PPAD-hard and is in PPP$\cap$PPA.



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