Geodesic
Functions with a Finite Number of Negative Squares
Canadian mathematical bulletin, Tome 15 (1972) no. 3, pp. 399-410

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

Let f be a complex-valued function defined on the real line R with the property that for every x∊R. If k is a nonnegative integer,f is said to have k negative squares, or to be indefinite of order k, if the Hermitian form 
Stewart, James. Functions with a Finite Number of Negative Squares. Canadian mathematical bulletin, Tome 15 (1972) no. 3, pp. 399-410. doi: 10.4153/CMB-1972-073-9
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