Abstract Algebra 9.2: Normal Subgroup Test

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In showing whether a subgroup is normal, it is often inconvenient to look at all possible left and right cosets. This video talks about a test that allows us to more easily determine the normality of a subgroup.
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thank you sir I am ur student here need more of ur teaching

emmanuelogwuche
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You stated at 5.58 that you showed that xHx^-1 is a subgroup of G. I can't find which video this is in. Please help

johndavies