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- W1996324305 abstract "A fully irreducible outer automorphism <inline-formula content-type=math/mathml> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML alttext=phi> <mml:semantics> <mml:mi>ϕ<!-- ϕ --></mml:mi> <mml:annotation encoding=application/x-tex>phi</mml:annotation> </mml:semantics> </mml:math> </inline-formula> of the free group <inline-formula content-type=math/mathml> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML alttext=upper F Subscript n> <mml:semantics> <mml:msub> <mml:mi>F</mml:mi> <mml:mi>n</mml:mi> </mml:msub> <mml:annotation encoding=application/x-tex>F_n</mml:annotation> </mml:semantics> </mml:math> </inline-formula> of rank <inline-formula content-type=math/mathml> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML alttext=n> <mml:semantics> <mml:mi>n</mml:mi> <mml:annotation encoding=application/x-tex>n</mml:annotation> </mml:semantics> </mml:math> </inline-formula> has an expansion factor which often differs from the expansion factor of <inline-formula content-type=math/mathml> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML alttext=phi Superscript negative 1> <mml:semantics> <mml:msup> <mml:mi>ϕ<!-- ϕ --></mml:mi> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mo>−<!-- − --></mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> <mml:annotation encoding=application/x-tex>phi ^{-1}</mml:annotation> </mml:semantics> </mml:math> </inline-formula>. Nevertheless, we prove that the ratio between the logarithms of the expansion factors of <inline-formula content-type=math/mathml> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML alttext=phi> <mml:semantics> <mml:mi>ϕ<!-- ϕ --></mml:mi> <mml:annotation encoding=application/x-tex>phi</mml:annotation> </mml:semantics> </mml:math> </inline-formula> and <inline-formula content-type=math/mathml> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML alttext=phi Superscript negative 1> <mml:semantics> <mml:msup> <mml:mi>ϕ<!-- ϕ --></mml:mi> <mml:mrow class=MJX-TeXAtom-ORD> <mml:mo>−<!-- − --></mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> <mml:annotation encoding=application/x-tex>phi ^{-1}</mml:annotation> </mml:semantics> </mml:math> </inline-formula> is bounded above by a constant depending only on the rank <inline-formula content-type=math/mathml> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML alttext=n> <mml:semantics> <mml:mi>n</mml:mi> <mml:annotation encoding=application/x-tex>n</mml:annotation> </mml:semantics> </mml:math> </inline-formula>. We also prove a more general theorem applying to an arbitrary outer automorphism of <inline-formula content-type=math/mathml> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML alttext=upper F Subscript n> <mml:semantics> <mml:msub> <mml:mi>F</mml:mi> <mml:mi>n</mml:mi> </mml:msub> <mml:annotation encoding=application/x-tex>F_n</mml:annotation> </mml:semantics> </mml:math> </inline-formula> and its inverse and their two spectrums of expansion factors." @default.
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- W1996324305 date "2007-02-08" @default.
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- W1996324305 title "The expansion factors of an outer automorphism and its inverse" @default.
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- W1996324305 doi "https://doi.org/10.1090/s0002-9947-07-04066-4" @default.
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