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

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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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     title = {On a {Relation} {Between} a {Theorem} of {Hartman} and a {Theorem} of {Sherman}},
     journal = {Canadian mathematical bulletin},
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     year = {1973},
     volume = {16},
     number = {2},
     doi = {10.4153/CMB-1973-046-7},
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