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Hyperbolic geometry is more closely related to Euclidean geometry than it seems: the only axiomatic difference is the parallel postulate.When the parallel postulate is removed from Euclidean geometry the resulting geometry is absolute geometry.There are two kinds of absolute geometry, Euclidean and hyperbolic.All theorems of absolute geometry, including the first 28 propositions of book one of Euclid's ''Elements'',

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