,
Juqiu Wang
,
Mingji Xia
,
Jiayi Zheng
Creative Commons Attribution 4.0 International license
Holant is an essential framework in the field of counting complexity. For over fifteen years, researchers have been clarifying the complexity classification for complex-valued Holant on Boolean domain, a challenge that remains unresolved. In this article, we prove a complexity dichotomy for complex-valued Holant on Boolean domain when a non-trivial signature of odd arity exists. This dichotomy is based on the dichotomy for #EO, and consequently is an FP^NP vs. #P dichotomy as well, stating that each problem is either in FP^NP or #P-hard. Furthermore, we establish a generalized version of the decomposition lemma for complex-valued Holant on Boolean domain. It asserts that each signature can be derived from its tensor product with other signatures, or conversely, the problem itself is in FP^NP. We believe that this result is a powerful method for building reductions in complex-valued Holant, as it is also employed as a pivotal technique in the proof of the aforementioned dichotomy in this article.
@InProceedings{meng_et_al:LIPIcs.CCC.2025.23,
author = {Meng, Boning and Wang, Juqiu and Xia, Mingji and Zheng, Jiayi},
title = {{From an Odd Arity Signature to a Holant Dichotomy}},
booktitle = {40th Computational Complexity Conference (CCC 2025)},
pages = {23:1--23:20},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-379-9},
ISSN = {1868-8969},
year = {2025},
volume = {339},
editor = {Srinivasan, Srikanth},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CCC.2025.23},
URN = {urn:nbn:de:0030-drops-237177},
doi = {10.4230/LIPIcs.CCC.2025.23},
annote = {Keywords: Complexity dichotomy, Counting, Holant problem, #P}
}