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Necessary conditions and sufficient conditions for disfocality and disconjugacy of a differential equation
A necessary and sufficient criterion for the (k,n — k)disfocality of the equation y{n) + p(x)y — 0, a α, such that the equation is not disconjuate on [α, t]. If the conjugate point of a exists, it is denoted by η(a). There exists a solution associated with the interval …