Geodesic
A Witt Theorem for Non-Defective Lattices
Canadian journal of mathematics, Tome 30 (1978) no. 3, pp. 499-511

Voir la notice de l'article provenant de la source Cambridge University Press

In [10], Witt laid the foundation for the study of quadratic forms over fields. Suppose Q is a quadratic form defined on a finite dimensional vector space V over a field of characteristic not equal to 2. Witt showed that non-zero vectors x and y in V satisfying Q(x) = Q(y) can be mapped into each other via an isometry of the vector space V. More generally, if τ : W⟶ W’ is an isometry between subspaces of V, then τ extends to an isometry φ of V. 
Morin-Strom, Karl A. A Witt Theorem for Non-Defective Lattices. Canadian journal of mathematics, Tome 30 (1978) no. 3, pp. 499-511. doi: 10.4153/CJM-1978-045-5
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