Jamel Ben Amara
Systems-conjugate points were introduced and studied by Barrett  in relation with the self-adjoint fourth order differential equation
where r(x)>0, p(x)>0 and q=0. In this paper we extend some of his results to more general cases, when q(x) is free of sign restrictions.
Submitted July 28, 2016. Published September 12, 2016.
Math Subject Classifications: 47E05, 34B05, 34C10.
Key Words: Fourth-order boundary value problems; system-conjugate points; subwronskians; comparison theorems.
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| Jamel Ben Amara |
University of Tunis El Manar
Faculty of Sciences of Tunis, Tunisia
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