Realization functors in algebraic triangulated categories

Abstract Let $${\mathcal {T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>T</mml:mi> </mml:math> be an algebraic triangulated category and $${\mathcal {C}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>C</mml:mi> </mml:math> an extension-closed subcategory with $${{\,\textrm{Hom}\,}}({\mathcal {C}}, \Sigma ^{&lt;0} {\mathcal {C}})=0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mspace/> <mml:mtext>Hom</mml:mtext> <mml:mspace/> </mml:mrow> <mml:mo>(</mml:mo> <mml:mi>C</mml:mi> <mml:mo>,</mml:mo> <mml:msup> <mml:mi>Σ</mml:mi> <mml:mrow> <mml:mo>&lt;</mml:mo> <mml:mn>0</mml:mn> </mml:mrow> </mml:msup> <mml:mi>C</mml:mi> <mml:mo>)</mml:mo> <mml:mo>=</mml:mo> <mml:mn>0</mml:mn> </mml:mrow> </mml:math> . Then $${\mathcal {C}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>C</mml:mi> </mml:math> has an exact structure induced from exact triangles in $${\mathcal {T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>T</mml:mi> </mml:math> . Keller and Vossieck say that there exists a triangle functor $$\operatorname {D}^{b}({\mathcal {C}}) \rightarrow {\mathcal {T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mo>D</mml:mo> <mml:mi>b</mml:mi> </mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>C</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>→</mml:mo> <mml:mi>T</mml:mi> </mml:mrow> </mml:math> extending the inclusion $${\mathcal {C}} \subseteq {\mathcal {T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>C</mml:mi> <mml:mo>⊆</mml:mo> <mml:mi>T</mml:mi> </mml:mrow> </mml:math> . We provide the missing details for a complete proof.

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Publication Details

Journal
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg
Published
2025-04-01
DOI
https://doi.org/10.1007/s12188-025-00289-5
Primary Topic
Algebraic structures and combinatorial models
Type
article
Field-Weighted Citation Impact
0.00

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article

Realization functors in algebraic triangulated categories

Julia Sauter, Janina C. Letz
Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg
Algebraic structures and combinatorial models
article

Realization functors in algebraic triangulated categories

Julia Sauter, Janina C. Letz
article en

Abstract

Abstract Let $${\mathcal {T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>T</mml:mi> </mml:math> be an algebraic triangulated category and $${\mathcal {C}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>C</mml:mi> </mml:math> an extension-closed subcategory with $${{\,\textrm{Hom}\,}}({\mathcal {C}}, \Sigma ^{&lt;0} {\mathcal {C}})=0$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mrow> <mml:mspace/> <mml:mtext>Hom</mml:mtext> <mml:mspace/> </mml:mrow> <mml:mo>(</mml:mo> <mml:mi>C</mml:mi> <mml:mo>,</mml:mo> <mml:msup> <mml:mi>Σ</mml:mi> <mml:mrow> <mml:mo>&lt;</mml:mo> <mml:mn>0</mml:mn> </mml:mrow> </mml:msup> <mml:mi>C</mml:mi> <mml:mo>)</mml:mo> <mml:mo>=</mml:mo> <mml:mn>0</mml:mn> </mml:mrow> </mml:math> . Then $${\mathcal {C}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>C</mml:mi> </mml:math> has an exact structure induced from exact triangles in $${\mathcal {T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>T</mml:mi> </mml:math> . Keller and Vossieck say that there exists a triangle functor $$\operatorname {D}^{b}({\mathcal {C}}) \rightarrow {\mathcal {T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:msup> <mml:mo>D</mml:mo> <mml:mi>b</mml:mi> </mml:msup> <mml:mrow> <mml:mo>(</mml:mo> <mml:mi>C</mml:mi> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>→</mml:mo> <mml:mi>T</mml:mi> </mml:mrow> </mml:math> extending the inclusion $${\mathcal {C}} \subseteq {\mathcal {T}}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>C</mml:mi> <mml:mo>⊆</mml:mo> <mml:mi>T</mml:mi> </mml:mrow> </mml:math> . We provide the missing details for a complete proof.

Abhandlungen aus dem Mathematischen Seminar der Universität HamburgVol. 95(1)
Bielefeld University (DE)
Alexander von Humboldt-Stiftung, Deutsche Forschungsgemeinschaft, Bundesministerium für Bildung und Forschung, Universität Bielefeld
Openalex Percentile: Top 85%
Algebraic structures and combinatorial models
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Realization functors in algebraic triangulated categories — Julia Sauter, Janina C. Letz · Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg (2025) | TGRS Research Map | TGRS