Geodesic
Linear inverse problems for multi-term equations with Riemann~--- Liouville derivatives
The Bulletin of Irkutsk State University. Series Mathematics, Tome 38 (2021), pp. 36-53

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The issues of well-posedness of linear inverse coefficient problems for multi-term equations in Banach spaces with fractional Riemann – Liouville derivatives and with bounded operators at them are considered. Well-posedness criteria are obtained both for the equation resolved with respect to the highest fractional derivative, and in the case of a degenerate operator at the highest derivative in the equation. Two essentially different cases are investigated in the degenerate problem: when the fractional part of the order of the second-oldest derivative is equal to or different from the fractional part of the order of the highest fractional derivative. Abstract results are applied in the study of inverse problems for partial differential equations with polynomials from a self-adjoint elliptic differential operator with respect to spatial variables and with Riemann – Liouville derivatives in time.
Keywords: inverse problem, Riemann – Liouville fractional derivative, degenerate evolution equation, initial-boundary value problem. 
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     author = {M. M. Turov and V. E. Fedorov and B. T. Kien},
     title = {Linear inverse problems for multi-term equations with {Riemann~---} {Liouville} derivatives},
     journal = {The Bulletin of Irkutsk State University. Series Mathematics},
     pages = {36--53},
     publisher = {mathdoc},
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     year = {2021},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IIGUM_2021_38_a2/}
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M. M. Turov; V. E. Fedorov; B. T. Kien. Linear inverse problems for multi-term equations with Riemann~--- Liouville derivatives. The Bulletin of Irkutsk State University. Series Mathematics, Tome 38 (2021), pp. 36-53. http://geodesic.mathdoc.fr/item/IIGUM_2021_38_a2/