Abstract
Spaces of ultrasmooth vectors of some elliptic differential operators are described. In particular, elliptic operators with strong singular coefficients in the neighborhood of the boundary and generalized Legendre differential operators are considered.
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References
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Dmytryshyn, M.I. Ultrasmooth Vectors of Singular Elliptic Differential Operators. Journal of Mathematical Sciences 107, 3558–3561 (2001). https://doi.org/10.1023/A:1011981921225
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DOI: https://doi.org/10.1023/A:1011981921225