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Electronic Colloquium on Computational Complexity

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TR18-179 | 31st October 2018
Dominik Scheder

PPSZ on CSP Instances with Multiple Solutions

We study the success probability of the PPSZ algorithm on $(d,k)$-CSP formulas. We greatly simplify the analysis of Hertli, Hurbain, Millius, Moser, Szedlak, and myself for the notoriously difficult case that the input formula has more than one satisfying assignment.

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TR18-178 | 9th October 2018
Leroy Chew

Hardness and Optimality in QBF Proof Systems Modulo NP

Quantified Boolean Formulas (QBFs) extend propositional formulas with Boolean quantifiers. Working with QBF differs from propositional logic in its quantifier handling, but as propositional satisfiability (SAT) is a subproblem of QBF, all SAT hardness in solving and proof complexity transfers to QBF. This makes it difficult to analyse efforts dealing ... more >>>


TR18-177 | 1st October 2018
Alexander Knop

The Diptych of Communication Complexity Classes in the Best-partition Model and the Fixed-partition Model

Most of the research in communication complexity theory is focused on the
fixed-partition model (in this model the partition of the input between
Alice and Bob is fixed). Nonetheless, the best-partition model (the model
that allows Alice and Bob to choose the partition) has a lot of
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