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We present a new proof of a part of the nilpotent orbit theorem for unipotent complex variations of Hodge structure. In our proof, the $L^2$ extension theorem of Ohsawa-Takegoshi type plays an essential role.

Algebraic Geometry · Mathematics 2022-11-24 Taro Fujisawa

We give a purely derivator-theoretical reformulation and proof of a classic result of Happel and Ladkani, showing that it occurs uniformly across stable derivators and it is then independent of coefficients. The resulting equivalence…

Representation Theory · Mathematics 2025-08-05 Chiara Sava

We consider networks of infinite-dimensional port-Hamiltonian systems $\mathfrak{S}_i$ on one-dimensional spatial domains. These subsystems of port-Hamiltonian type are interconnected via boundary control and observation and are allowed to…

Analysis of PDEs · Mathematics 2020-07-14 Björn Augner

It is well-known that in homotopy type theory (HoTT), one can prove the Eckmann-Hilton theorem: given two 2-loops p, q : 1 = 1 on the reflexivity path at an arbitrary point a : A, we have pq = qp. If we go one dimension higher, i.e., if p…

Logic in Computer Science · Computer Science 2021-08-02 Kristina Sojakova

In this paper we study a model structure on a category of schemes with a group action and the resulting unstable and stable equivariant motivic homotopy theories. The new model structure introduced here samples a comparison to the one by…

Algebraic Topology · Mathematics 2013-12-03 Philip Herrmann

The goal of this dissertation is to present results from synthetic homotopy theory based on homotopy type theory (HoTT). After an introduction to Martin-L\"of's dependent type theory and homotopy type theory, key results include a synthetic…

Algebraic Topology · Mathematics 2024-09-25 Yuhang Wei

We give a construction of classifiers for double negation stable h-propositions in a variety of cubical set models of homotopy type theory and cubical type theory. This is used to give some relative consistency results: classifiers for…

Logic · Mathematics 2022-10-03 Andrew W. Swan

For a NIP theory $T$, a sufficiently saturated model $\mathfrak{C}$ of $T$, and an invariant (over some small subset of $\mathfrak{C}$) global type $p$, we prove that there exists a finest relatively type-definable over a small set of…

Logic · Mathematics 2025-07-16 Krzysztof Krupiński , Adrián Portillo

Motivated by Simpson's conjecture on the motivicity of rigid irreducible connections, Esnault and Groechenig demonstrated that the mod-$p$ reductions of such connections on smooth projective varieties have nilpotent $p$-curvatures. In this…

Algebraic Geometry · Mathematics 2025-12-10 Pengfei Huang , Yichen Qin , Hao Sun

We prove that symmetric monoidal weak n-groupoids in the Tamsamani model provide a model for stable n-types. Moreover, we recover the classical statement that Picard categories model stable 1-types.

Algebraic Topology · Mathematics 2020-06-16 Lyne Moser , Viktoriya Ozornova , Simona Paoli , Maru Sarazola , Paula Verdugo

We establish a kind of "degree zero Freudenthal Gm-suspension theorem" in motivic homotopy theory. From this we deduce results about the conservativity of the P^1-stabilization functor. In order to establish these results, we show how to…

K-Theory and Homology · Mathematics 2022-01-12 Tom Bachmann

This article presents a clear proof of the Riemann Mapping Theorem via Riemann's method, uncompromised by any appeals to topological intuition.

Complex Variables · Mathematics 2016-12-14 Robert E. Greene , Kang-Tae Kim

Building on To\"en's work on affine stacks, we develop a certain homotopy theory for schemes, which we call "unipotent homotopy theory." Over a field of characteristic $p>0$, we prove that the unipotent homotopy group schemes…

Algebraic Geometry · Mathematics 2025-08-20 Shubhodip Mondal , Emanuel Reinecke

Many introductions to homotopy type theory and the univalence axiom gloss over the semantics of this new formal system in traditional set-based foundations. This expository article, written as lecture notes to accompany a 3-part mini course…

Category Theory · Mathematics 2024-03-04 Emily Riehl

We prove in this paper the stability and asymptotic stability in H^1 of a decoupled sum of N solitons for the subcritical generalized KdV equations $u_t+(u_{xx}+u^p)_x=0$ (1<p<5). The proof of the stability result is based on energy…

Analysis of PDEs · Mathematics 2007-05-23 Yvan Martel , Frank Merle , Tai-Peng Tsai

We provide a nilpotency criterion for fusion systems in terms of the vanishing of its cohomology with twisted coefficients.

Algebraic Topology · Mathematics 2018-04-17 Antonio Díaz Ramos , Arturo Espinosa Baro , Antonio Viruel

In this very short note we show that the residual nilpotence of pure Artin groups of spherical type is easily deduced from the faithfulness of the Krammer-Digne representations.

Group Theory · Mathematics 2007-05-23 Ivan Marin

Considered herein is the integrable two-component Camassa-Holm shallow water system derived in the context of shallow water theory, which admits blow-up solutions and the solitary waves interacting like solitons. Using modulation theory,…

Analysis of PDEs · Mathematics 2015-09-29 Xingxing Liu

We develop an approach to proving the Rost nilpotence principle involving higher unramified cohomology. We use this to prove the principle for certain varieties of dimension $\leq 3$ over a perfect field.

Algebraic Geometry · Mathematics 2019-09-05 Humberto A. Diaz

Vietoris-Rips and degree Rips complexes are represented as homotopy types by their underlying posets of simplices, and basic homotopy stability theorems are recast in these terms. These homotopy types are viewed as systems (or functors),…

Algebraic Topology · Mathematics 2020-10-28 J. F. Jardine