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  text: '[summary:  A "hypercomputer" is an imaginary artifact required to answer some crisp question that can't be answered in the limit of arbitrarily large finite computers.  For example, if you have a question that depends on a general solution to the [Halting Problem](https://en.wikipedia.org/wiki/Halting_problem), we say that to solve this problem requires a "hypercomputer".  (In particular, it requires a level-1 halting oracle.)\n\nIt seems exceptionally unlikely that hypercomputers will ever be discovered to be embedded into our physical universe.  We just use this as a label so we can say, for certain impossible programs, "Supposing we had a hypercomputer and could run this impossible program, what would be the consequences?"\n\nFor an example of interesting code that requires a hypercomputer, see [11w].  The relations between different levels of hypercomputer are also useful for crisply describing agents that have better or worse abilities to predict one another.]\n\nA "hypercomputer" is an imaginary artifact required to answer some crisp question that can't be answered in the limit of arbitrarily large finite computers.  For example, if you have a question that depends on a general solution to the [Halting Problem](https://en.wikipedia.org/wiki/Halting_problem), then we say that to solve this problem requires a "hypercomputer", and in particular, a level-1 halting oracle.  (If you need to determine whether programs on level-1 halting oracles halt, you need a level-2 halting oracle, which we would also call a "hypercomputer".)\n\nIt seems exceptionally unlikely that hypercomputers will ever be discovered to be embedded into our physical universe.  The term "hypercomputer" just exists as a label so we can say, "Supposing we had a hypercomputer and ran this (impossible) program, what would be the consequences?"\n\nFor some examples of conceptually illuminating code that would require a hypercomputer to actually run, see [11w] and [11v].\n\n[107 Unbounded analysis] of agents sometimes invokes hypercomputers because this lets us talk about multiple agents with easy-to-describe knowledge relations to each other.  [has-requisite(arithmetical_hierarchy): For example, we might talk about Agent X that uses Zermelo-Fraenkel set theory as a proof system and has a $\\Pi_n$ oracle, and another Agent Y that uses Peano Arithmetic and has a $\\Pi_{n+1}$ oracle, to encode a set of relations where Y can directly predict and model X, and X can do proofs about Y.] [!has-requisite(arithmetical_hierarchy): For example, we might talk about Agent X that uses a weak hypercomputer and a strong proof system, and Agent Y that has a strong hypercomputer and a weak proof system, to describe a scenario where Y can directly predict and model X, and X can do proofs about Y.]  In these cases, we're not trying to say that the relation between agents X and Y intrinsically requires them to have impossible powers of computation.  We're just reaching for an unphysical scenario that happens to crisply encode inter-agent relations we find interesting for some reason, and allows these inter-agent relations to have consequences about which we can easily do proofs.\n\nSee also [the Wikipedia page on hypercomputation](https://en.wikipedia.org/wiki/Hypercomputation).',
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