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Título del libro: Aisb/iacap World Congress 2012: Natural Computing/unconventional Computing And Its Philosophical Significance, Part Of Alan Turing Year 2012 Título del capítulo: Some constraints on the physical realizability of a mathematical construction
Mathematical constructions of abstract entities are normally done disregarding their actual physical realizability. The definition and limits of the physical realizability of these constructions are controversial issues at the moment and the subject of intense debate. In this paper, we consider a simple and particular case, namely, the physical realizability of the enumeration of rational numbers by Cantor's diagonalization by means of an Ising system. We contend that uncertainty in determining a particular state in an Ising system renders impossible to have a reliable implementation of Cantor's diagonal method and therefore a stronger physical system is required. We also point out what are the particular limitations of this system from the perspective physical realizability.
