Unconventional Computation
Unconventional Computation
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非常规计算
DOI:
10.1007/978-3-642-03745-0_11
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Welch P
中科院分区:
文献类型:
--
作者:
Welch P
Simple models in Malament-Hogarth spacetimes, up to Δ^1_1 or HYP.(2) Ordinal Time Register Machines: up to Π^1_1-.(3) Infinite Time Turing Machines: up to Π^1_2-Det (Σ^0_2) and beyond. In this paper we survey some of the complexity issues surrounding discrete models of transfinite recursion. We emphasise today the connections with Proof Theory, Reverse Mathematics, and Subsystems of Second Order Number Theory as set forth in Simpson’s 13. Our concerns are thus mainly the logico-mathematical ones of analysing such models rather ‘implementational concerns’(to put it broadly).