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See [Fey88] for the following statement:
[…]. I often use the analogy of a Chess game: one can learn all the rules of Chess, but one doesn't know how to play well. […] The present situation in physics is as if we know Chess, but we don't know one or two rules. […] In Chess, bringing the pieces towards the centre of the board increases their general strength. This is a principle which is not contained explicitly in reading the rules of Chess, but can be understood in terms of the rules of Chess in an indirect fashion. The principle is obviously a consequence of only those rules and nothing else. […] It's just a question of finding convenient methods for analysing complex systems. […] | ||
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This should be enough motivation to start work now!