On the sign-regularity of positive fourth-order differential operators
نشر في Anton Vladimirov
بتاريخ 2016
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English
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الملخص بالإنكليزية
It is shown that positivity in $(0,1)times (0,1)$ of Green function of positively defined fourth-order ordinary differential operator (with separated boundary conditions) is a criterium of sign-regularity of this operator.