P. Freitas

activity

19992026

most citedA lower bound to the spectral threshold in curved tubes

43 citations · 106 across the 34 of their papers we have counts for

collaborators

Showing 1999Show all

1 paper · 1 filter

math.SP1999★ 2 cited

On the invariant spectrum of $S^{1}$ -invariant metrics on $S^{2}$

Miguel Abreu, Pedro Freitas

A theorem of J. Hersch (1970) states that for any smooth metric on $S^{2}$ , with total area equal to $4 π$ , the first nonzero eigenvalue of the Laplace operator acting on functions is…

On the invariant spectrum of S1-invariant metrics on S2

On the invariant spectrum of $S^{1}$ -invariant metrics on $S^{2}$