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A unified approach to the effects of symmetry and periodicity on boundary-value problems

✍ Scribed by Bunch, K. J. ;Grow, R. W.


Publisher
Springer
Year
1992
Tongue
English
Weight
750 KB
Volume
13
Category
Article
ISSN
0195-9271

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## History of the problem While it is relatively easy to get estimations of upper bounds for eigerivalues of elliptic differential operators with the well-known methods of J. W. S. RAYLEIGH and W. RITZ, the estimation of lower bounds is much more complicated. Estimations of lower bounds for eigenv