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I was reading Why Geography Matters by de Blij, and in the first chapter (page 15) he says But, as so often happens when social engineers get hold of a system that’s working well, the wheels came off. Professional educators thought they had a better idea about how to teach geography: rather than educating […] Abstract: This paper presents an isomorphism between the set of problems in P and the Natural Numbers, and an isomorphism between the set of problem in NP and the powerset of the Naturals. Using these isomorphisms the properties of the equivalent classes P and NP are investigated. A property is found which holds for one […] |
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