Emergent Mind

Kolmogorov complexities Kmax, Kmin on computable partially ordered sets

(0801.0351)
Published Jan 2, 2008 in math.LO and cs.LO

Abstract

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 KD_{min} = K{D{rev}}_{max}, where D{rev} is the reverse order, we prove that either KD_{min} ={ct} KD{max} ={ct} KD (={ct} is equality up to a constant) or KD_{min}, KD_{max} are <={ct} incomparable and <{ct} KD and >{ct} K{0',D}. We characterize the orders leading to each case. We also show that KD{min}, KD_{max} cannot be both much smaller than KD 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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