# unconditional

## P vs. PSPACE ★★★

Author(s): Folklore

\begin{problem} Is there a problem that can be computed by a Turing machine in polynomial space and unbounded time but not in polynomial time? More formally, does P = PSPACE? \end{problem}

Keywords: P; PSPACE; separation; unconditional

## Unconditional derandomization of Arthur-Merlin games ★★★

Author(s): Shaltiel; Umans

\begin{problem} Prove \emph{unconditionally} that \Def[$\mathcal{AM}$]{Arthur-Merlin_protocol} $\subseteq$ \Def[$\Sigma_2$]{Polynomial_hierarchy}. \end{problem}

Keywords: Arthur-Merlin; Hitting Sets; unconditional