Lesieur, L. Théorie algébrique de l’orientation. (French) Zbl 0116.38004 Algebre Theorie Nombres, Sem. P. Dubreil et C. Pisot 10 (1956/57), No. 12, 12 p. (1958). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:foundations of geometry, non-Euclidean geometry PDFBibTeX XML Full Text: Numdam EuDML