english: Some of the greatest minds in the history of mathematics ask this question, people like Ibn al-Haytham, Omar Khayyam, Nasir al-Din al-Tusi, Giovanni Saccheri, János Bolyai, Carl Gauss, and Nikolai Lobachevsky.
non_english: Matematik tarihinin bazı büyük dehaları bu soruyu sordular, İbn-i Heysem, Ömer Hayyam, Nasîrüddin Tûsî, Giovanni Saccheri, János Bolyai, Carl Gauss, ve Nikolai Lobachevsky gibi.