File:Théorie des parallèles Lobatchevsky 1855.png
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![File:Théorie des parallèles Lobatchevsky 1855.png](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e7/Th%C3%A9orie_des_parall%C3%A8les_Lobatchevsky_1855.png/369px-Th%C3%A9orie_des_parall%C3%A8les_Lobatchevsky_1855.png?20181021131718)
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