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討論串[代數] subgroup
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有人解了 不過還是提供另外一個方法. Consider f: GLn(R) -> R\{0}, f=(det)^2.. (R\{0} is a group under the natural multiplication). f(AB) = (det(AB)^2) = (detA)^2 (detB)
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The definition of subgroup (by I.N. Herstein) (可以請教這裡的hersteinXD). A subset H of the group G is a subgroup of G if and only if it is. nonempty and clo
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