Quantum Mechanics from Focusing and Symmetry

A foundation of quantum mechanics based on the concepts of focusing and symmetry is proposed. Focusing is connected to c-variables - inaccessible conceptually derived variables; several examples of such variables are given. The focus is then on a maximal accessible parameter, a function of the common c-variable. Symmetry is introduced via a group acting on the c-variable. From this, the Hilbert space is constructed and state vectors and operators are given a clear interpretation. The Born formula is proved from weak assumptions, and from this the usual rules of quantum mechanics are derived. Several paradoxes and other issues of quantum theory are discussed.Comment: 26 page

El marketing social en EspaÑa: SituaciÑn actual y estrategias para su desarrollo

itMarketing social, itcomportamientos, éticay solidaridad, Social marketing, behaviours, ethics and solidarity,

Loss of Information in Estimating Item Parameters in Incomplete Designs

incomplete designs, conditional maximum likelihood, marginal maximum likelihood, F-information, Rasch model, loss of information,