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Retitle: fix typo and be a little more explicit
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Automorphsims extendedCharacterising extendable automorphisms |
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Automorphsims extendedSuppose H is a subgroup of a finite group G. Can the group of all automorphisms of H that extend to G can be characterized somehow? What condition on the group extension would guarantee that any automorphism of H can be extended to G?
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