A new proof of a theorem of Ivanov and Schupp
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🧮 math.GR
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ivanovproofschuppsubgrouptheoremexistsfinitelyfollowing
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The object of this note is to give a very short proof of the following theorem of Ivanov and Schupp. Let H be a finitely generated subgroup of a free group F and the index [F:H] infinite. Then there exists a nontrivial normal subgroup N of F such that N cap H = {1}.
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