Geodesic
On a Relation Between a Theorem of Hartman and a Theorem of Sherman
Canadian mathematical bulletin, Tome 16 (1973) no. 2, pp. 275-281

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

We are concerned with the nth-order linear differential equation 1 where the coefficients are assumed to be continuous. Hartman [1] proved that (see Definition 2) the first conjugate point η1 (t) of t satisfies 2 Hartman actually proved a more general result which has very important applications in nonlinear differential equations. 
Peterson, A. C. On a Relation Between a Theorem of Hartman and a Theorem of Sherman. Canadian mathematical bulletin, Tome 16 (1973) no. 2, pp. 275-281. doi: 10.4153/CMB-1973-046-7
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