English: Non-Euclidean geometry models proposed by Felix Klein (left) and Henri Poincaré (right). Illustration from book.
Polski: Modele geometrii nieeuklidesowej zaproponowane przez Felixa Kleina (lewy) oraz Henri Poincaré'a (prawy) w której kąty odpowiadają geometrii Łobaczewskiego. Na podstawie książki Krzysztof Ciesielski, Zdzisław Pogoda: Bezmiar Matematycznej Wyobraźni, Warszawa 2005.
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