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6
votes
Artin exercise 2.5.4: Let $f:\Bbb R^+\to\Bbb C^\times$ be the map $f(x)=e^{ix}$. Prove that $f$ is a homomorphism, and determine its kernel and image.
group-theory
solution-verification
group-homomorphism
asked Apr 9, 2021 at 19:29
math.stackexchange.com
5
votes
Understanding short exact sequences
group-theory
exact-sequence
asked Apr 11, 2021 at 5:23
math.stackexchange.com
5
votes
Proving a function is an automorphism, but not an inner automorphism
group-theory
solution-verification
asked Mar 25, 2021 at 4:23
math.stackexchange.com
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