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- W4214544959 abstract "Abstract We study the Bieri–Neumann–Strebel–Renz invariants and we prove the following criterion: for groups H and K of type <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mrow> <m:mi>F</m:mi> <m:mo></m:mo> <m:msub> <m:mi>P</m:mi> <m:mi>n</m:mi> </m:msub> </m:mrow> </m:math> {FP_{n}} such that <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mrow> <m:mrow> <m:mo stretchy=false>[</m:mo> <m:mi>H</m:mi> <m:mo>,</m:mo> <m:mi>H</m:mi> <m:mo stretchy=false>]</m:mo> </m:mrow> <m:mo>⊆</m:mo> <m:mi>K</m:mi> <m:mo>⊆</m:mo> <m:mi>H</m:mi> </m:mrow> </m:math> {[H,H]subseteq Ksubseteq H} and a character <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mrow> <m:mi>χ</m:mi> <m:mo>:</m:mo> <m:mrow> <m:mi>K</m:mi> <m:mo>→</m:mo> <m:mi>ℝ</m:mi> </m:mrow> </m:mrow> </m:math> {chi:Ktomathbb{R}} with <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mrow> <m:mrow> <m:mi>χ</m:mi> <m:mo></m:mo> <m:mrow> <m:mo stretchy=false>(</m:mo> <m:mrow> <m:mo stretchy=false>[</m:mo> <m:mi>H</m:mi> <m:mo>,</m:mo> <m:mi>H</m:mi> <m:mo stretchy=false>]</m:mo> </m:mrow> <m:mo stretchy=false>)</m:mo> </m:mrow> </m:mrow> <m:mo>=</m:mo> <m:mn>0</m:mn> </m:mrow> </m:math> {chi([H,H])=0} , we have <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mrow> <m:mrow> <m:mo stretchy=false>[</m:mo> <m:mi>χ</m:mi> <m:mo stretchy=false>]</m:mo> </m:mrow> <m:mo>∈</m:mo> <m:mrow> <m:msup> <m:mi mathvariant=normal>Σ</m:mi> <m:mi>n</m:mi> </m:msup> <m:mo></m:mo> <m:mrow> <m:mo stretchy=false>(</m:mo> <m:mi>K</m:mi> <m:mo>,</m:mo> <m:mi>ℤ</m:mi> <m:mo stretchy=false>)</m:mo> </m:mrow> </m:mrow> </m:mrow> </m:math> {[chi]inSigma^{n}(K,mathbb{Z})} if and only if <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mrow> <m:mrow> <m:mo stretchy=false>[</m:mo> <m:mi>μ</m:mi> <m:mo stretchy=false>]</m:mo> </m:mrow> <m:mo>∈</m:mo> <m:mrow> <m:msup> <m:mi mathvariant=normal>Σ</m:mi> <m:mi>n</m:mi> </m:msup> <m:mo></m:mo> <m:mrow> <m:mo stretchy=false>(</m:mo> <m:mi>H</m:mi> <m:mo>,</m:mo> <m:mi>ℤ</m:mi> <m:mo stretchy=false>)</m:mo> </m:mrow> </m:mrow> </m:mrow> </m:math> {[mu]inSigma^{n}(H,mathbb{Z})} for every character <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mrow> <m:mi>μ</m:mi> <m:mo>:</m:mo> <m:mrow> <m:mi>H</m:mi> <m:mo>→</m:mo> <m:mi>ℝ</m:mi> </m:mrow> </m:mrow> </m:math> {mu:Htomathbb{R}} that extends χ. The same holds for the homotopical invariants <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mrow> <m:msup> <m:mi mathvariant=normal>Σ</m:mi> <m:mi>n</m:mi> </m:msup> <m:mo></m:mo> <m:mrow> <m:mo stretchy=false>(</m:mo> <m:mo>-</m:mo> <m:mo stretchy=false>)</m:mo> </m:mrow> </m:mrow> </m:math> {Sigma^{n}(-)} when K and H are groups of type <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mi>F</m:mi> <m:mi>n</m:mi> </m:msub> </m:math> {F_{n}} . We use these criteria to complete the description of the Σ-invariants of the Bieri–Stallings groups <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:msub> <m:mi>G</m:mi> <m:mi>m</m:mi> </m:msub> </m:math> {G_{m}} , and more generally to describe the Σ-invariants of the Bestvina–Brady groups. We also show that the “only if” direction of the above criterion holds if we assume only that K is a subnormal subgroup of H , where both groups are of type <m:math xmlns:m=http://www.w3.org/1998/Math/MathML> <m:mrow> <m:mi>F</m:mi> <m:mo></m:mo> <m:msub> <m:mi>P</m:mi> <m:mi>n</m:mi> </m:msub> </m:mrow> </m:math> {FP_{n}} . We apply this last result to wreath products." @default.
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- W4214544959 date "2022-03-01" @default.
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- W4214544959 title "On the Bieri–Neumann–Strebel–Renz Σ-invariants of the Bestvina–Brady groups" @default.
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