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Revista Sigma 2009
La Fórmula Fundamental de la Geometría no EuclidianaKeywords: Non-euclideans geometry , hyperbolic geometry , spheric trigonometry , angle of parallelism Abstract: One appears two different forms to obtain the formula of non-euclidian geometry. First assuming the idea of Taurinus, over the formulas hyperbolic geometry are obtained soon from the trigonometry of a sphere with imaginary radio and finally whit rigor of Lobachevsky in their book.
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