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Computer Algebra with GAP
[OWP-2023-03] (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 ...
Edifices: Building-like Spaces Associated to Linear Algebraic Groups; In memory of Jacques Tits
[OWP-2023-04] (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 ...
Automatic Differentiation for ML-Familiy Languages: Correctness via Logical Relations
[OWP-2023-07] (Mathematisches Forschungsinstitut Oberwolfach, 2023-06-19)
Flag-Accurate Arrangements
[OWP-2023-01] (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 ...
Ground State of Bose Gases Interacting through Singular Potentials
[OWP-2023-18] (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 ...
Bochner-Riesz Means at the Critical Index: Weighted and Sparse Bounds
[OWP-2023-16] (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 ...
The Brown Complex in Non-Defining Characteristic and Applications
[OWP-2023-14] (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 ...
Multi-Dimensional Summation-by-Parts Operators for General Function Spaces: Theory and Construction
[OWP-2023-13] (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 ...
Semantic Factorization and Descent
[OWP-2023-05] (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 ...
Logical Relations for Partial Features and Automatic Differentiation Correctness
[OWP-2023-09] (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 ...