P. Freitas

activity

19992005

most citedA Li-type criterion for zero-free half-planes of Riemann's zeta function

2 citations · 2 across the 1 of their papers we have counts for

collaborators

Showing math.SPShow all

2 papers · 1 filter

math.SP2000

Closed nodal lines and interior hot spots of the second eigenfunction of the Laplacian on surfaces

P. Freitas

We build a one-parameter family of S^{1}-invariant metrics on the unit disc with fixed total area for which the second eigenvalue of the Laplace operator in the case of both Neuman…

math.SP1999

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…

Closed nodal lines and interior hot spots of the second eigenfunction of the Laplacian on surfaces

On the invariant spectrum of S1-invariant metrics on S2

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