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A tensor extriangulated category is an extriangulated category with a symmetric monoidal structure that is compatible with the extriangulated structure. To this end we define a notion of a biextriangulated functor $\mathcal{A} \times…

Category Theory · Mathematics 2025-02-26 Raphael Bennett-Tennenhaus , Isambard Goodbody , Janina C. Letz , Amit Shah

For any essentially small triangulated category the centre of its lattice of thick subcategories is introduced; it is a spatial frame and yields a notion of central support. A relative version of this centre recovers the support theory for…

Category Theory · Mathematics 2023-11-28 Henning Krause

The $\star_M$-family of tensor-tensor products is a framework which generalizes many properties from linear algebra to third order tensors. Here, we investigate positive semidefiniteness and semidefinite programming under the…

Optimization and Control · Mathematics 2025-07-18 Alex Dunbar , Elizabeth Newman

Given a tensor triangulated category we investigate the geometry of the Balmer spectrum as a locally ringed space. Specifically we construct functors assigning to every object in the category a corresponding sheaf and a notion of support…

Category Theory · Mathematics 2021-11-12 James Rowe

Following the theory of tensor triangular support introduced by Sanders, which generalizes the Balmer-Favi support, we prove the local version of the result of Zou that the Balmer spectrum being Hochster weakly scattered implies the…

Category Theory · Mathematics 2024-08-28 Nicola Bellumat

We define and characterise small support for complexes over non-Noetherian rings and in this context prove a vanishing theorem for modules. Our definition of support makes sense for any rigidly compactly generated tensor triangulated…

Commutative Algebra · Mathematics 2017-10-30 William T. Sanders

We prove that the map on Balmer spectra induced by a fully faithful geometric functor is a quotient map whose fibers are connected. This is an analogue of the Zariski Connectedness Theorem in algebraic geometry and it can be applied to a…

Algebraic Topology · Mathematics 2025-08-05 Beren Sanders

We prove that the Balmer spectrum of a tensor triangulated category is homeomorphic to the Zariski spectrum of its graded central ring, provided the triangulated category is generated by its tensor unit and the graded central ring is…

Category Theory · Mathematics 2016-10-05 Ivo Dell'Ambrogio , Donald Stanley

We present some results on equivariant KK-theory in the context of tensor triangular geometry. More specifically, for G a finite group, we show that the spectrum of the tensor triangulated subcategory of KK^G generated by the tensor unit…

K-Theory and Homology · Mathematics 2011-01-13 Ivo Dell'Ambrogio

A graded tensor category over a group $G$ will be called a crossed product tensor category if every homogeneous component has at least one multiplicatively invertible object. Our main result is a description of the crossed product tensor…

Quantum Algebra · Mathematics 2015-10-12 César Galindo

We prove that a jointly conservative family of geometric functors between rigidly-compactly generated tensor triangulated categories induces a surjective map on Balmer spectra. From this we deduce a fiberwise criterion for Balmer's…

Category Theory · Mathematics 2024-09-27 Tobias Barthel , Natalia Castellana , Drew Heard , Beren Sanders

We show that a compact rigid balanced braided monoidal category with enough compact projective objects gives rise to a system of mapping class group representations compatible with the gluing along marked intervals. A motivation to consider…

Quantum Algebra · Mathematics 2026-02-24 Deniz Yeral

In this paper we give necessary and sufficient conditions for a functor to be representable in a strongly generated triangulated category which has a linear action by a graded ring, and we discuss some applications and examples.

Category Theory · Mathematics 2022-12-16 Janina C. Letz

This paper is concerned with the prime spectrum of a tensor product of algebras over a field. It seeks necessary and sufficient conditions for such a tensor product to have the S-property, strong S-property, and catenarity. Its main results…

Commutative Algebra · Mathematics 2007-05-23 S. Bouchiba , D. E. Dobbs , S. Kabbaj

We compare the homological support and tensor triangular support for `big' objects in a rigidly-compactly generated tensor triangulated category. We prove that the comparison map from the homological spectrum to the tensor triangular…

Algebraic Topology · Mathematics 2023-01-05 Tobias Barthel , Drew Heard , Beren Sanders

We endow the homotopy category of well generated (pretriangulated) dg categories with a tensor product satisfying a universal property. The resulting monoidal structure is symmetric and closed with respect to the cocontinuous RHom of dg…

Category Theory · Mathematics 2021-07-23 Wendy Lowen , Julia Ramos González

Given a fixed tensor triangulated category S we consider triangulated categories T together with an S-enrichment which is compatible with the triangulated structure of T. It is shown that, in this setting, an enriched analogue of Brown…

Category Theory · Mathematics 2016-04-05 Johan Steen , Greg Stevenson

We explain why every non-trivial exact tensor functor on the triangulated category of mixed motives over a field F has zero kernel, if one assumes "all" motivic conjectures. In other words, every non-zero motive generates the whole category…

Algebraic Geometry · Mathematics 2021-07-27 Martin Gallauer

The balanced tensor product M (x)_A N of two modules over an algebra A is the vector space corepresenting A-balanced bilinear maps out of the product M x N. The balanced tensor product M [x]_C N of two module categories over a monoidal…

Quantum Algebra · Mathematics 2019-07-17 Christopher L. Douglas , Christopher Schommer-Pries , Noah Snyder

We show that in a finite tensor category, the tensor product property holds for support varieties if and only if it holds between indecomposable periodic objects. We apply this to certain Hopf algebras in the form of skew group algebras. In…

Quantum Algebra · Mathematics 2024-06-07 Petter Andreas Bergh , Julia Yael Plavnik , Sarah Witherspoon