FOCS Conference 2022 Conference Paper
Separations in Proof Complexity and TFNP
- Mika Göös
- Alexandros Hollender
- Siddhartha Jain 0002
- Gilbert Maystre
- William Pires
- Robert Robere
- Ran Tao 0013
It is well-known that Resolution proofs can be efficiently simulated by Sherali-Adams (SA) proofs. We show 1, however, that any such simulation needs to exploit huge coefficients: Resolution cannot be efficiently simulated by SA when the coefficients are written in unary. We also show that Reversible Resolution (a variant of MaxSAT Resolution) cannot be efficiently simulated by Nullstellensatz (NS). These results have consequences for total NP search problems. First, we characterise the classes PPADS, PPAD, SOPL by unary-SA, unary-NS, and Reversible Resolution, respectively. Second, we show that, relative to an oracle, PLS $\nsubseteq$ PPP, SOPL $\nsubseteq$ PPA, and EOPL $\nsubseteq$ UEOPL. In particular, together with prior work, this gives a complete picture of the black-box relationships between all classical TFNP classes introduced in the 1990s. 1 This is an extended abstract. For the full version of this article, please refer to [GHJ+22b].