90 research outputs found
37. Imbraguglia (G.), Badolati (G. S.), Morchio (R.), Battegazzore (A. M.), Messina (G.), Index Empedocleus
No full textBrunet Philippe. 37. Imbraguglia (G.), Badolati (G. S.), Morchio (R.), Battegazzore (A. M.), Messina (G.), Index Empedocleus. In: Revue des Études Grecques, tome 105, fascicule 500-501, Janvier-juin 1992. pp. 289-290
Un accès direct à Empédocle : G. Imbraguglia, G. Badolati, R. Morchio, A. Battegazzore, G. Messina, Index Empedocleus.
No full textLévêque Pierre. Un accès direct à Empédocle : G. Imbraguglia, G. Badolati, R. Morchio, A. Battegazzore, G. Messina, Index Empedocleus.. In: Dialogues d'histoire ancienne, vol. 18, n°2, 1992. pp. 367-368
Atti rogati a Gressoney nei secoli XV e XVI. Regesti (dall'Archivio della famiglia di Nicola De La Pierre)
No full textDynamics of mean-field spin models from basic results in abstract differential equations
No full textThe infinite-volume limit of the dynamics of (generalized) mean-field spin models is obtained through a direct analysis of the equations of motion, in a large class of representations of the spin algebra. The resulting dynamics fits into a general framework for systems with long-range interaction: variables at infinity appear in the time evolution of local variables and spontaneous symmetry breaking with an energy gap follows from this mechanism. The independence of the construction of the approximation scheme in finite volume is proven. © 1992 Plenum Publishing Corporation
The extension problem for partial Boolean structures in quantum mechanics
No full textAlternative partial Boolean structures, implicit in the discussion of classical representability of sets of quantum mechanical predictions, are characterized, with definite general conclusions on the equivalence of the approaches going back to Bell and Kochen-Specker. An algebraic approach is presented, allowing for a discussion of partial classical extension, amounting to reduction of the "number of contexts," classical representability arising as a special case. As a result, known techniques are generalized and some of the associated computational difficulties overcome. The implications on the discussion of Boole-Bell inequalities are indicated. © 2010 American Institute of Physics
The harmonic and melodic connection numbers involving the mutual inclusions among the generic groups of notes arbitrarily emitted
No full textThe present paper is aimed to provide specific details and new
results related to the music network described in the previous study by the
author. While the first paper served as an introduction and extensive
analysis of the model in all its potential applications, the present study is
aimed at providing supplementary data to quantitatively support the
previous one. The music concepts described in the present paper concern
the evaluation of all the potential mutual inclusions and connections
among chords, scales, and more in general any generic group of notes
arbitrarily played by each musician. These concepts characterize the
specific algorithm purposely developed and implemented in an interactive
software application tool that can be employed for performing the melodic
and harmonic analyses of any kind of tune. Geometric music graphs that
take into account these groups are automatically designed by the software
in order to trace the harmonic and melodic zones touched by each music
composition. These geometric graphs are constituted by the connections
(that can also represent mutual inclusions) among the generic groups of
notes. The primary focus of the present paper is on the quantitative results
and data characterizing the inner structure related to these graphs
Quantum Mechanics and Stochastic Mechanics for Compatible Observables at Different Times
No full textBohm mechanics and Nelson stochastic mechanics are confronted with quantum mechanics in the
presence of noninteracting subsystems. In both cases, it is shown that correlations at different times of
compatible position observables on stationary states agree with quantum mechanics only in the case
of product wave functions. By appropriate Bell-like inequalities it is shown that no classical theory,
in particular no stochastic process, can reproduce the quantum mechanical correlations of position
variables of noninteracting systems at different times
Bell inequalities as constraints on unmeasurable correlations
No full textThe interpretation of the violation of Bell-Clauser-Horne inequalities is revisited, in relation with the notion of extension of QM predictions to unmeasurable correlations. Such extensions are compatible with QM predictions in many cases, in particular for observables with compatibility relations described by tree graphs. This implies classical representability of any set of correlations 〈Ai〉, 〈B〉, 〈AiB〉, and the equivalence of the Bell-Clauser-Horne inequalities to a non void intersection between the ranges of values for the unmeasurable correlation 〈A1A2 〉 associated to different choices for B. The same analysis applies to the Hardy model and to the “perfect correlations ” discussed by Greenberger, Horne, Shimony and Zeilinger. In all the cases, the dependence of an unmeasurable correlation on a set of variables allowing for a classical representation is the only basis for arguments about violations of locality and causality. 1 a
Infrared and vacuum structure in two-dimensional local quantum field theory models. The massless scalar field
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