6 papers
On Cutting Cakes and Crossing Curves
Alexandros Hollender, Gilbert Maystre, Kilian Risse
We consider the classic envy-free cake-cutting problem where the goal is to cut and allocate a divisible resource among a set of agents in a way that avoids any envy between them.…
Superpolynomial Length Lower Bounds for Tree-Like Semantic Proof Systems with Bounded Line Size
Susanna F. de Rezende, David Engström, Yassine Ghannane +1
We prove superpolynomial length lower bounds for the semantic tree-like Frege refutation system with bounded line size. Concretely, for any function $n^{2-\varepsilon} \leq s(n) \l…
On bounded depth proofs for Tseitin formulas on the grid; revisited
Johan HÃ¥stad, Kilian Risse
We study Frege proofs using depth- Boolean formulas for the Tseitin contradiction on grids. We prove that if each line in the proof is of size then the number o…
Exponential Resolution Lower Bounds for Weak Pigeonhole Principle and Perfect Matching Formulas over Sparse Graphs
Susanna F. de Rezende, Jakob Nordström, Kilian Risse +1
We show exponential lower bounds on resolution proof length for pigeonhole principle (PHP) formulas and perfect matching formulas over highly unbalanced, sparse expander graphs, th…
Graph Colouring Is Hard on Average for Polynomial Calculus and Nullstellensatz
Jonas Conneryd, Susanna F. de Rezende, Jakob Nordström +2
We prove that polynomial calculus (and hence also Nullstellensatz) over any field requires linear degree to refute that sparse random regular graphs, as well as sparse ErdÅs-Rény…
Supercritical Tradeoffs for Monotone Circuits
Mika Göös, Gilbert Maystre, Kilian Risse +1
We exhibit a monotone function computable by a monotone circuit of quasipolynomial size such that any monotone circuit of polynomial depth requires exponential size. This is the fi…