Range of the first two eigenvalues of the laplacian
1994 ◽
Vol 447
(1930)
◽
pp. 397-412
◽
Keyword(s):
For each planar domain D of unit area, the first two Dirichlet eigenvalues of —∆ on D determine a point (λ 1 ( D ), λ 2 ( D ) in the (λ 1 , λ 2 ) plane. As D varies over all such domains, this point varies over a set R which we determine. Its boundary consists of two semi-infinite straight lines and a curve connecting their endpoints. This curve is found numerially. We also show how to minimize the n th eigenvalue when the minimizing domain is diconnected. For n = 3 we show that the minimizing domain is connected and that λ 3 is a local minimum for D a circular disc.
1970 ◽
Vol 28
◽
pp. 260-261
Keyword(s):
1971 ◽
Vol 29
◽
pp. 156-157
Keyword(s):
1973 ◽
Vol 31
◽
pp. 268-269
1984 ◽
Vol 42
◽
pp. 234-235
1988 ◽
Vol 46
◽
pp. 624-625
1985 ◽
Vol 43
◽
pp. 426-429
Keyword(s):
1997 ◽
Vol 40
(2)
◽
pp. 400-404
◽
Keyword(s):
1892 ◽
Vol 34
(866supp)
◽
pp. 13832-13833
Keyword(s):