The operator $L_0:D_{L_0}\subset H \rightarrow H$, $L_0u = \frac 1r \frac d {dr} \left\{r \frac d{dr}\left[\frac 1r \frac d{dr}\left(r \frac {du}{dr}\right)\right] \right\}$, $D_{L_0}= \{u \in C^4 ([0,R]), u'(0)=u''''(0)=0, u(R)=u'(R)=0\}$, $H=L_{2,r}(0,R)$ is shown to be essentially self-adjoint, positive definite with a compact resolvent. The conditions on $L_0$ (in fact, on a general symmetric operator) are given so as to justify the application of the Fourier method for solving the problems of the types $L_0u=g$ and $u_{tt}+L_0u=g$, respectively.
@article{104315, author = {Leopold Herrmann}, title = {A study of an operator arising in the theory of circular plates}, journal = {Applications of Mathematics}, volume = {33}, year = {1988}, pages = {337-353}, zbl = {0658.73037}, mrnumber = {0961312}, language = {en}, url = {http://dml.mathdoc.fr/item/104315} }
Herrmann, Leopold. A study of an operator arising in the theory of circular plates. Applications of Mathematics, Tome 33 (1988) pp. 337-353. http://gdmltest.u-ga.fr/item/104315/
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