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- Instituto Superior TécnicoPT39 papers
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- Institute of Astrophysics and Space SciencesPT23 papers
- European Southern ObservatoryCL13 papers
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7 papers · 1 filter
P-partitions and a multi-parameter Klyachko idempotent
Peter McNamara, Christophe Reutenauer
Because they play a role in our understanding of the symmetric group algebra, Lie idempotents have received considerable attention. The Klyachko idempotent has attracted interest f…
Truncated microsupport and hyperbolic inequalities
Ana Rita Martins, Teresa Monteiro Fernandes
We prove that the k-truncated microsupport of the specialization of a complex of sheaves along a submanifold is contained in the normal cone to the conormal bundle along the k-…
A Li-type criterion for zero-free half-planes of Riemann's zeta function
Pedro Freitas
We define a sequence of real functions which coincide with Li's coefficients at one and which allow us to extend Li's criterion for the Riemann Hypothesis to yield a necessary and…
Maximal Sidon Sets and Matroids
J. A. Dias da Silva, Melvyn B. Nathanson
Let X be a subset of an abelian group and a_1,...,a_h,a'_1,...,a'_h a sequence of 2h elements of X such that a_1 + ... + a_h = a'_1 + ... + a'_h. The set X is a Sidon set of order…
Varying the Population Size of Artificial Foraging Swarms on Time Varying Landscapes
Carlos Fernandes, Vitorino Ramos, Agostinho C. Rosa
Swarm Intelligence (SI) is the property of a system whereby the collective behaviors of (unsophisticated) entities interacting locally with their environment cause coherent functio…
Metallicity of M dwarfs I. A photometric calibration and impact on the mass-luminosity relation at the bottom of the main sequence
X. Bonfils, X. Delfosse, S. Udry +3
We obtained high resolution ELODIE and CORALIE spectra for both components of 20 wide visual binaries composed of an F-, G- or K-dwarf primary and an M-dwarf secondary. We analyse…