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Time consistent expected mean-variance in multistage stochastic quadratic optimization: a model and a matheuristic
(Springer, 2019)
In this paper, we present a multistage time consistent Expected Conditional Risk Measure for minimizing a linear combination of the expected mean and the expected variance, so-called Expected Mean-Variance. The model is ...
Pro-C congruence properties for groups of rooted tree automorphisms
(Springer, 2018-12-13)
We propose a generalisation of the congruence subgroup problem for groups acting on rooted trees.
Instead of only comparing the profinite completion to that given by level stabilizers, we also compare pro-C completions ...
On the congruence subgroup property for GGS-groups
(AMS, 2017-01-31)
We show that all GGS-groups with non-constant defining vector satisfy the congruence subgroup property. This provides, for every odd prime p, many examples of finitely generated, residually finite, non-torsion groups whose ...
On the concept of fractality for groups of automorphisms of a regular rooted tree
(Societat Catalana de Matemàtiques, 2016-04-20)
The aim of this article is to discuss and clarify the notion of fractality for subgroups of the group of automorphisms of a regular rooted tree. For this purpose we define three types of fractality. We show that they are ...
The MIT bag model as an infinite mass limit
(École polytechnique, 2019)
The Dirac operator, acting in three dimensions, is considered. Assuming that a
large mass m > 0 lies outside a smooth enough and bounded open set Ω ⊂ R3, it is proved that
its spectrum approximates the one of the Dirac ...
Shell interactions for Dirac operators
(2017-08-03)
The cohomology of the sporadic group J2 over F3.
(De Gruyter, 2014-08-19)
We describe the cohomology ring H*(J_2; F_3) both as a subring of H*(3_+^{1+2};F_3) and with an abstract presentation. We also give its Poincaré series. Our calculational tool is the first author's spectral sequence for ...
Sensitivity Studies for a Hybrid Numerical-Statistical Short-Term Wind and Gust Forecast at Three Locations in the Basque Country (Spain)
(MDPI, 2019-12-29)
This study evaluates the performance of statistical models applied to the output of numerical models for short-term (1–24 h) hourly wind forecasts at three locations in the Basque Country. The target variables are horizontal ...
Some characterizations of the tensor product of complete lattices with applications to quantales
(Springer, 2018-09-17)
This paper examines tensor products of complete lattices in which one factor is com- pletely distributive. At least five characterizations of complete distributivity involving tensor products of complete lattices are given, ...
Cohomology of p-groups of nilpotency class smaller than p
(De Gruyter, 2018-01-17)
Let p be a prime number, let d be an integer and let G be a d-generated finite p-group of nilpotency class smaller than p. Then the number of possible isomorphism types for the mod p cohomology algebra H^∗(G;F_p) is bounded ...