# Tag Info

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Two answers that I learnt while writing a blog post about this question No: In black-box variants, quantum query/communication complexity offer the Grover quadratic speedup, but not more than that. As Ron points out, this extends to computational complexity under plausible assumptions. Maybe: Nash equilibrium is arguably the flagship problem of "Christos ...

9

I will attempt to elaborate a bit on why CHKPRR shows that $\mathsf{PPAD}$ is plausibly hard for quantum computers. At a high level, CHKPRR builds a distribution over end-of-line instances where finding a solution requires to either: break the soundness of the proof system obtained by applying the Fiat-Shamir heuristic to the famous sumcheck protocol, or ...

5

No, it's not true. Consider this game where the row player's actions are A,B,C and column's are D,E (shown are the row player's payoffs): D E A 1 0 B 0 1 C 0.6 0.6 I think that in any equilibrium, the row player plays only C. But now if the column player uses a no-regret algorithm, every sample will either be action D or E, and the ...

4

Is there a tool which solves parametric games? Not that I am aware of (I am a co-author of GTE and help with Gambit). The best suggestion I have if you don't find such a tool (and I doubt one exists) is to do a parameter sweep and solve a bunch of individual instantiations and see what the resulting sets of equilibria say about $EQ()$. Gambit is very ...

1

If you look at the definition for Nash equilibrium, you can see that if both $A$ and $B$ are in $\texttt{State 4}$, then if $A$ changes their mind that would mean that they would be defecting from a situation where they get $1$ point to one where they get $0$, a net decrease since at $\texttt{State 4}$ they are both defecting. Similarly for player $B$. The ...

1

The game you're describing is a continuous-time principal-agent problem. See A continuous-time version of the principal-agent problem (Sannikov 2008). Technically the goal there is to induce optimal effort from the employee, but, by the revelation principal, that's equivalent to having him reveal his private information.

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