Penrose (2004: 865):
It is clear that we are far from a theory which can reliably address all these issues. But I hope, at least, that I have been able to persuade the reader of the fundamental importance of having a quantum mechanics with a viable ontology. The issues that are addressed in Chapters 29 and 30 of this book are not just matters of philosophical interest. The importance of having an ontologically coherent (improved) quantum mechanics cannot, in my view, be over-estimated. In this section, I have touched upon just one of the foundational issues that could be deeply affected by knowledge of such a theory. There are many more, including situations in biology, where as with the early universe, the present-day ‘Copenhagen’ viewpoint cannot really be applied — there being no clear division into a quantum system and a classical measuring device.
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From the perspective of Systemic Functional Linguistic Theory, it is a viable epistemology that quantum mechanics requires. Quantum mechanics has invalidated the epistemological assumption that meaning transcends semiotic systems. The ontology that follows from the epistemological assumption that meaning is immanent, and does not transcend semiotic systems, merely requires the additional distinction between potential and instance to make it coherent and viable. This makes the distinction between 'a quantum system' (potential and instance) and 'a classical measuring device' (instance of potential) perfectly clear.
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