English

Some exact values of the inducibility and statistics constants for hypercubes

Combinatorics 2025-10-08 v3

Abstract

We consider two types of problems: maximising, over subsets S{0,1}nS\subseteq \{0,1\}^n, the density of dd-subcubes CC in the nn-hypercube graph that span a subgraph such that SCS\cap C is i) isomorphic to the given configuration H{0,1}dH\subseteq\{0,1\}^d (the inducibility problem), or ii) has the given size ss (the statistics problem). Using flag algebras, we determine the limit of this density as nn\to\infty for 5 new configurations H{0,1}3H\subseteq\{0,1\}^3 and for 3 new pairs (d,s)(d,s), namely for (3,2)(3,2), (4,2)(4,2) and (4,4)(4,4). Interestingly, the lower bounds in the last three cases come from blowups of small Hamming codes.

Keywords

Cite

@article{arxiv.2503.03408,
  title  = {Some exact values of the inducibility and statistics constants for hypercubes},
  author = {Levente Bodnár and Oleg Pikhurko},
  journal= {arXiv preprint arXiv:2503.03408},
  year   = {2025}
}

Comments

13 pages, 3 figures