可计算偏序集上的Kolmogorov复杂度Kmax，Kmin
Kolmogorov complexities Kmax, Kmin on computable partially ordered sets
摘要：
We introduce a machine free mathematical framework to get a natural formalization of some general notions of infinite computation in the context of Kolmogorov complexity. Namely, the classes Max^{X \to D}_{PR} and Max^{X \to D}_{Rec} of functions X \to D which are pointwise maximum of partial or total computable sequences of functions where D = (D,<) is some computable partially ordered set . The enumeration theorem and the invariance theorem always hold for Max^{X \to D}_{PR}, leading to a variant KD;max of Kolmogorov complexity. We characterize the orders D such that the enumeration theorem (resp. the invariance theorem) also holds for Max^{X \to D}_{Rec} . It turns out that Max^{X \to D}_{Rec} may satisfy the invariance theorem but not the enumeration theorem. Also, when Max^{X \to D}_{Rec} satisfies the invariance theorem then the Kolmogorov complexities associated to Max^{X \to D}_{Rec} and Max^{X \to D}_{PR} are equal (up to a constant). Letting K^ D_{min} = K^{D^{rev}}_{max}, where D^{rev} is the reverse order, we prove that either K^ D_{min} =_{ct} K^ D_{max} =_{ct} K^D (=_{ct} is equality up to a constant) or K^ D_{min} , K^ D_{max} are <=_{ct} incomparable and <_{ct} K^D and >_{ct} K^{0',D}. We characterize the orders leading to each case. We also show that K^ D_{min} , K^ D_{max} cannot be both much smaller than K^D at any point. These results are proved in a more general setting with two orders on D, one extending the other.
英文摘要：
We introduce a machine free mathematical framework to get a natural formalization of some general notions of infinite computation in the context of Kolmogorov complexity. Namely, the classes Max^{X\to D}_{PR} and Max^{X\to D}_{Rec} of functions X \to D which are pointwise maximum of partial or total computable sequences of functions where D = (D,<) is some computable partially ordered set. The enumeration theorem and the invariance theorem always hold for Max^{X\to D}_{PR}, leading to a variant KD;max of Kolmogorov complexity. We characterize the orders D such that the enumeration theorem (resp. the invariance theorem) also holds for Max^{X\to D}_{Rec} . It turns out that Max^{X\to D}_{Rec} may satisfy the invariance theorem but not the enumeration theorem. Also, when Max^{X\to D}_{Rec} satisfies the invariance theorem then the Kolmogorov complexities associated to Max^{X\to D}_{Rec} and Max^{X\to D}_{PR} are equal (up to a constant). Letting K^D_{min} = K^{D^{rev}}_{max}, where D^{rev} is the reverse order, we prove that either K^D_{min} =_{ct} K^D_{max} =_{ct} K^D (=_{ct} is equality up to a constant) or K^D_{min}, K^D_{max} are <=_{ct} incomparable and <_{ct} K^D and >_{ct} K^{0',D}. We characterize the orders leading to each case. We also show that K^D_{min}, K^D_{max} cannot be both much smaller than K^D at any point. These results are proved in a more general setting with two orders on D, one extending the other.
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