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@@ -226,6 +226,11 @@ It would be nice if we can characterize good parts in rigidity matroids with 1-t
\section{Greedy base packing}
\section{Principal sequence + KT contraction}
Recently, Mohit Daga \cite{Daga_2025} combines the principal sequence of partitions and Kawarabayashi-Thorup contractions to get a sub-$n^k$ deterministic algorithm for $k$-cut in simple unweighted graphs.
Recall that in the ideal tree packing framework \cite{Thorup_2008}, one finds the first partition with $\geq k$ parts in the principal sequence and then merge parts to get a bound. However, the idea in \cite{Daga_2025} is that, instead of finding the first partition with $\geq k$ parts, one finds the last partition $P$ with $<k$ parts and show that the optimal $k$-cut can be expressed as the $E[G/P]$ together with some internal cuts and some singleton isolations inside parts of $P$.
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@article{cunningham_optimal_1985,
title = {Optimal attack and reinforcement of a network},
volume = {32},
issn = {0004-5411, 1557-735X},
url = {https://dl.acm.org/doi/10.1145/3828.3829},
doi = {10.1145/3828.3829},
language = {en},
number = {3},
urldate = {2025-04-11},
journal = {Journal of the ACM},
author = {Cunningham, William H.},
month = jul,
year = {1985},
pages = {549--561},
title = {Optimal attack and reinforcement of a network},
volume = {32},
issn = {0004-5411, 1557-735X},
url = {https://dl.acm.org/doi/10.1145/3828.3829},
doi = {10.1145/3828.3829},
language = {en},
number = {3},
urldate = {2025-04-11},
journal = {Journal of the ACM},
author = {Cunningham, William H.},
month = jul,
year = {1985},
pages = {549--561}
}
@article{chekuri_lp_2020,
title = {{LP} {Relaxation} and {Tree} {Packing} for {Minimum} $k$-{Cut}},
volume = {34},
issn = {0895-4801, 1095-7146},
url = {https://epubs.siam.org/doi/10.1137/19M1299359},
doi = {10.1137/19M1299359},
language = {en},
number = {2},
urldate = {2022-04-10},
journal = {SIAM Journal on Discrete Mathematics},
author = {Chekuri, Chandra and Quanrud, Kent and Xu, Chao},
month = jan,
year = {2020},
keywords = {Approximation, K-cut, Minimum cut, Tree packing},
pages = {1334--1353},
title = {{LP} {Relaxation} and {Tree} {Packing} for {Minimum} $k$-{Cut}},
volume = {34},
issn = {0895-4801, 1095-7146},
url = {https://epubs.siam.org/doi/10.1137/19M1299359},
doi = {10.1137/19M1299359},
language = {en},
number = {2},
urldate = {2022-04-10},
journal = {SIAM Journal on Discrete Mathematics},
author = {Chekuri, Chandra and Quanrud, Kent and Xu, Chao},
month = jan,
year = {2020},
keywords = {Approximation, K-cut, Minimum cut, Tree packing},
pages = {1334--1353}
}
@inproceedings{Thorup_2008,
address = {Victoria British Columbia Canada},
title = {Minimum k-way cuts via deterministic greedy tree packing},
ISBN = {9781605580470},
url = {https://dl.acm.org/doi/10.1145/1374376.1374402},
DOI = {10.1145/1374376.1374402},
booktitle = {Proceedings of the fortieth annual ACM symposium on Theory of
computing},
publisher = {ACM},
author = {Thorup, Mikkel},
year = {2008},
month = may,
pages = {159166},
language = {en},
address = {Victoria British Columbia Canada},
title = {Minimum k-way cuts via deterministic greedy tree packing},
isbn = {9781605580470},
url = {https://dl.acm.org/doi/10.1145/1374376.1374402},
doi = {10.1145/1374376.1374402},
booktitle = {Proceedings of the fortieth annual ACM symposium on Theory of computing},
publisher = {ACM},
author = {Thorup, Mikkel},
year = {2008},
month = may,
pages = {159166},
language = {en}
}
@article{thorup_fully-dynamic_2007,
title = {Fully-{Dynamic} {Min}-{Cut}*},
volume = {27},
issn = {0209-9683, 1439-6912},
url = {http://link.springer.com/10.1007/s00493-007-0045-2},
doi = {10.1007/s00493-007-0045-2},
language = {en},
number = {1},
urldate = {2023-02-05},
journal = {Combinatorica},
author = {Thorup, Mikkel},
month = feb,
year = {2007},
pages = {91--127},
file = {Thorup_2007_Fully-Dynamic
Min-Cut.pdf:/Users/congyu/Zotero/storage/Q329VHH3/Thorup_2007_Fully-Dynamic
Min-Cut.pdf:application/pdf},
title = {Fully-{Dynamic} {Min}-{Cut}\textasteriskcentered},
volume = {27},
issn = {0209-9683, 1439-6912},
url = {http://link.springer.com/10.1007/s00493-007-0045-2},
doi = {10.1007/s00493-007-0045-2},
language = {en},
number = {1},
urldate = {2023-02-05},
journal = {Combinatorica},
author = {Thorup, Mikkel},
month = feb,
year = {2007},
pages = {91--127},
file = {Thorup_2007_Fully-Dynamic Min-Cut.pdf:/Users/congyu/Zotero/storage/Q329VHH3/Thorup_2007_Fully-Dynamic Min-Cut.pdf:application/pdf}
}
@article{Daga_2025,
title = {Sub-$n^k$ Deterministic algorithm for minimum $k$-way cut in simple graphs},
url = {http://arxiv.org/abs/2512.12900},
doi = {10.48550/arXiv.2512.12900},
note = {arXiv:2512.12900},
number = {arXiv:2512.12900},
publisher = {arXiv},
author = {Daga, Mohit},
year = {2025},
month = dec
}