We discuss how the canonical commutation relations must be modified in order to make appropriate numerical models of quantum systems. The C∗-algebras associated with the discretized CCRs are the non-commutative spheres of Bratteli, Elliott, Evans and Kishimoto. 1991 Mathematics Subject Classification. Primary 46L40; Secondary 81E05.

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Many parallel processing networks can be viewed as graphs called k-ary n-cubes, whose special cases include rings, hypercubes and toruses. In this paper, combinatorial properties of k-ary n-cubes are explored. In particular, the problem of characterizing the subgraph of a given number of nodes with the maximum edge count is studied. These theoretical results are then used to compute a lower bou...

We show that the problem of predicate detection in distributed systems is NP-complete. We introduce a class of predicates, linear predicates, such that for any linear predicate B there exists an efficient detection of the least cut satisfyingB. The dual of linearity is post-linearity. These properties generalize several known properties of distributed systems, such as the set of consistent cuts...

PURPOSE The Canadian C-spine (cervical spine) Rule (CCR) and the National Emergency X-Radiography Utilization Low-Risk Criteria (NLC) are criteria designed to guide C-spine radiography in trauma patients. It is unclear how these 2 rules compare with young children. METHODS This study retrospectively examined case-matched trauma patients 10 years or younger. Two cohorts were identified-cohort ...

We provide new and tight lower bounds on the ability of players to implement equilibria using cheap talk, that is, just allowing communication among the players. One of our main results is that, in general, it is impossible to implement three-player Nash equilibria in a bounded number of rounds. We also give the first rigorous connection between Byzantine agreement lower bounds and lower bounds...

BACKGROUND MRI is an important clinical tool for diagnosing dementia-like diseases such as Frontemporal Dementia (FTD). However there is a need to develop more accurate and standardized MRI analysis methods. OBJECTIVE To compare FTD with Alzheimer's Disease (AD) and Mild Cognitive Impairment (MCI) with three automatic MRI analysis methods - Hippocampal Volumetry (HV), Tensor-based Morphometry...

Objetivo: Revisar a literatura com o objetivo de identificar as principais complicações do câncer colorretal (CCR). Revisão Bibliográfica: O CCR é um tumor maligno responsável por ser terceira causa morte associada ao no Brasil. pode classificado como familiar ou esporádico, sendo último, mais predominante. Devido diagnóstico tardio, déficit rastreio adequado, há aumento incidência complicações...