On Eigenvalues of Free Group Endomorphisms
classification
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math.GT
keywords
eigenvaluesfreegroupcontainedendomorphismendomorphismsfinite-indexfinitely
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Let \phi be an endomorphism of a finitely generated free group F, and let H be a finite-index subgroup of F that is invariant under \phi. The nonzero eigenvalues of \phi are contained in the eigenvalues of \phi restricted to H.
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