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The Emperor's New Mind

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In his bestselling work of popular science, Sir Roger Penrose takes us on a fascinating tour through the basic principles of physics, cosmology, mathematics, and philosophy to show that human thinking can never be emulated by a machine.

1989 R. Penrose Emperor's New Mind 144 [EPUB ref:15.224] Problems in NP which are not in P are regarded as being ‘intractable’ (i.e. though soluble in principle, they are ‘insoluble in practice’) for reasonably large n.