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Computer Algebra with GAP 

[OWP-2023-03] Piterman, Kevin I.; Vendramin, Leandro (Mathematisches Forschungsinstitut Oberwolfach, 2023-04-13)
This monograph includes the following topics: a basic introduction to the language, basic arithmetic, permutations, matrices, polynomial rings, finite fields, finite and finitely presented groups, small groups, group ...
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Edifices: Building-like Spaces Associated to Linear Algebraic Groups; In memory of Jacques Tits 

[OWP-2023-04] Bate, Michael; Martin, Benjamin; Röhrle, Gerhard (Mathematisches Forschungsinstitut Oberwolfach, 2023-06-19)
Given a semisimple linear algebraic k-group G, one has a spherical building ΔG, and one can interpret the geometric realisation ΔG(R) of ΔG in terms of cocharacters of G. The aim of this paper is to ...
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Automatic Differentiation for ML-Familiy Languages: Correctness via Logical Relations 

[OWP-2023-07] Lucatelli Nunes, Fernando; Vákár, Matthijs (Mathematisches Forschungsinstitut Oberwolfach, 2023-06-19)
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Flag-Accurate Arrangements 

[OWP-2023-01] Mücksch, Paul; Röhrle, Gerhard; Tran, Tan Nhat (Mathematisches Forschungsinstitut Oberwolfach, 2023-02-13)
In [MR21], the first two authors introduced the notion of an accurate arrangement, a particular notion of freeness. In this paper, we consider a special subclass, where the property of accuracy stems from a flag of flats ...
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Ground State of Bose Gases Interacting through Singular Potentials 

[OWP-2023-18] Boßmann, Lea; Leopold, Nikolai; Petrat, Sören; Rademacher, Simone (Mathematisches Forschungsinstitut Oberwolfach, 2023-11-27)
We consider a system of N bosons on the three-dimensional unit torus. The particles interact through repulsive pair interactions of the form N3β−1v(Nβx) for β∈(0,1). We prove the next order correction to ...
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Bochner-Riesz Means at the Critical Index: Weighted and Sparse Bounds 

[OWP-2023-16] Beltran, David; Roos, Joris; Seeger, Andreas (Mathematisches Forschungsinstitut Oberwolfach, 2023-11-27)
We consider Bochner-Riesz means on weighted Lp spaces, at the critical index λ(p)=d(1p−12)−12. For every A1-weight we obtain an extension of Vargas' weak type (1,1) inequality in some range ...
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The Brown Complex in Non-Defining Characteristic and Applications 

[OWP-2023-14] Rossi, Damiano (Mathematisches Forschungsinstitut Oberwolfach, 2023-07-25)
We study the Brown complex associated to the poset of ℓ-subgroups in the case of a finite reductive group defined over a field Fq of characteristic prime to ℓ. First, under suitable hypotheses, we ...
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Multi-Dimensional Summation-by-Parts Operators for General Function Spaces: Theory and Construction 

[OWP-2023-13] Glaubitz, Jan; Klein, Simon-Christian; Nordström, Jan; Öffner, Philipp (Mathematisches Forschungsinstitut Oberwolfach, 2023-07-25)
Summation-by-parts (SBP) operators allow us to systematically develop energy-stable and high-order accurate numerical methods for time-dependent differential equations. Until recently, the main idea behind existing SBP ...
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Semantic Factorization and Descent 

[OWP-2023-05] Lucatelli Nunes, Fernando (Mathematisches Forschungsinstitut Oberwolfach, 2023-06-19)
Let A be a 2-category with suitable opcomma objects and pushouts. We give a direct proof that, provided that the codensity monad of a morphism p exists and is preserved by a suitable morphism, the factorization ...
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Logical Relations for Partial Features and Automatic Differentiation Correctness 

[OWP-2023-09] Lucatelli Nunes, Fernando; Vákár, Matthijs (Mathematisches Forschungsinstitut Oberwolfach, 2023-06-19)
We present a simple technique for semantic, open logical relations arguments about languages with recursive types, which, as we show, follows from a principled foundation in categorical semantics. We demonstrate how it can ...
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