After introducing the notion of capacity in a general Hilbert space setting we look at the spectral bound of an arbitrary self-adjoint and semi-bounded operator
@incollection{JEDP_1999____A8_0, author = {Noll, Andr\'e}, title = {Domain perturbations, capacity and shift of eigenvalues}, booktitle = {}, series = {Journ\'ees \'equations aux d\'eriv\'ees partielles}, eid = {8}, pages = {1--10}, publisher = {Universit\'e de Nantes}, year = {1999}, mrnumber = {2000h:47023}, zbl = {01810581}, language = {en}, url = {http://www.numdam.org/item/JEDP_1999____A8_0/} }
Noll, André. Domain perturbations, capacity and shift of eigenvalues. Journées équations aux dérivées partielles (1999), article no. 8, 10 p. http://www.numdam.org/item/JEDP_1999____A8_0/
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