"Non-Euclidean Geometry is a history of the alternate geometries that have emerged since the rejection of Euclid s parallel postulate.
Then, starting with the 17th century, as mathematicians began to question whether it was actually possible to prove Euclid s postulate, he examines Non-Euclidean predecessors Saccheri, Lambert, Legendre.
Italian mathematician ROBERTO Bonola (1874 1911) begins by surveying efforts by Greek, Arab, and Renaissance mathematicians to close the gap in Euclid s axiom. "Non-Euclidean Geometry is a history of the alternate geometries that have emerged since the rejection of Euclid s parallel postulate