arXiv subjects
Publications and source records attributed to Ahmad Shafiei Deh Abad.
In this paper, inspired by the "Minimum Description Length Principle" in classical Statistics, we introduce a new method for predicting the outcomes of a quantum measurement and for estimating the state of a quantum system with minimum quantum complexity, while, at the same time, avoiding overfitting.
We study the relations between the recently proposed machine-independent quantum complexity of P. Gacs~\cite{Gacs} and the entropy of classical and quantum systems. On one hand, by restricting Gacs complexity to ergodic classical dynamical systems, we retrieve the equality between the Kolmogorov complexity rate and the Shannon entropy rate derived by A.A. Brudno~\cite{Brudno}. On the other hand, using the quantum Shannon-Mc Millan theorem~\cite{BSM}, we show that such an equality holds densely in the case of ergodic quantum spin chains.
In this paper which is the first of a series of papers on smooth structures, the concepts of C-structures and smooth structures are introduced and studied. The notion of smooth structure on semi-integral domains is given. It is shown that each semi-integral domain which is not a field, admits a unique smooth structure and a large class of non-polynomial smooth functions on some semi-integral domains is constructed. A smooth function from Z-{0} into Z is given which does not extend to a smooth function on Z. No concept from topology is used. As an application, it is shown that: Theorem - Let M and N be finite dimensional smooth manifolds. The algebra of real smooth functions on M (resp. N) will be denoted by A (resp. B). Assume that T is a homomorphism from B into A. Then, there exists exactly one smooth mapping f from M into N such that T=f*.