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In this paper the authors consider a pair of differential equations y 1 + p 1 ( x ) y 1 = 0 , y 2 + p 2 ( x ) y 2 = 0 {y_1} + {p_1}(x){y_1} = 0,{y_2} + {p_2}(x){y_2} = 0 , where p i ( x ) {p_i}(x) are positive and continuous, and where solutions y 1 ( x ) {y_1}(x) and y 2 ( x ) {y_2}(x) have common consecutive zeros at x = a x = a and x = b x = b . They show that if the curves y = p 1 ( x ) y = {p_1}(x) and y = p 2 ( x ) y = {p_2}(x) have a single intersection (possibly a closed subinterval) and if p 1 ( a ) > p 2 ( a ) , p 2 ( b ) > p 1 ( b ) {p_1}(a) > {p_2}(a),{p_2}(b) > {p_1}(b) , the first conjugate point of a + ε a + {\varepsilon } ( ε > 0 {\varepsilon } > 0 and small) for the second equation precedes that of the first.
Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations
Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations
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