Residually Finite Group
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In the mathematical field of group theory, a group G is residually finite or finitely approximable if for every nontrivial element g in G there is a homomorphism h from G to a finite group, such that h(g) neq 1., There are a number of equivalent definitions: A group is residually finite if for each non-identity element in the group, there is a normal subgroup of finite index not containing that element. A group is residually finite if and only if the intersection of…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In the mathematical field of group theory, a group G is residually finite or finitely approximable if for every nontrivial element g in G there is a homomorphism h from G to a finite group, such that h(g) neq 1., There are a number of equivalent definitions: A group is residually finite if for each non-identity element in the group, there is a normal subgroup of finite index not containing that element. A group is residually finite if and only if the intersection of all its subgroups of finite index is trivial. A group is residually finite if and only if the intersection of all its normal subgroups of finite index is trivial. A group is residually finite if and only if it can be embedded inside the direct product of a family of finite groups