The lack of correspondence between the abstract and the physical world seems sometimes to suggest that there are profound incompatibilities between what can be thought and what actually happens in the real world. One can ask, for example, how often one faces undecidable problems. However, the question of undecidability has been considered to be better [...]
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Tags:  computability  general  foundations of computation  universality and unsolvability  principle of computational equivalence  physics of computation