Published online by Cambridge University Press: 22 January 2016
Let K be the classical quaternion field over the field Q of rational numbers with the quaternion units 1, i, j, k, with relations i2 = j2 = − 1, k = ij = −ji. For a quaternion x ∈ K, we write its conjugate, trace and norm by and Nx, respectively. Put
and consider the map h: A → B defined by
1) H. Hopf, Über die Abbildungen von Sphären auf Sphären niedrigerer Dimension, Fund. Math. 25 (1935) 427-440.
2) T. Ono, On the Hopf fibration over Z, Nagoya Math. J. Vol. 56 (1975), 201-207, T. Ono. Quadratic fields and Hopf fibrations (to appear).
3) Yu V. Linnik, Quaternions and Cayley numbers. Some applications of quaternion arithmetic. (Russian), Uspehi Mat. Nauk, IV, 5(33), (1949) 49-98.