Houel translated both Lobachevsky 's and Beltrami's work into French in 1870 and he noted how Beltrami's paper proved the independence of the Euclid 's parallel postulate.
Houel isinalin sa parehong Lobachevsky 's at Beltrami ng trabaho sa Pranses sa 1870 at kung paano siya kilala Beltrami ng papel proved ang pagsasarili ng Euclid' s pagpaparis-kuro.