- #1
Bashyboy
- 1,421
- 5
Homework Statement
Let ##f : G \rightarrow H## be an epimorphism from a group ##G## to ##H## and let ##h \in H##, then ##f^{-1} (h) = g ~ker(f)##.
Homework Equations
The Attempt at a Solution
So, if I understand the problem correctly, we are trying to find a epimorphism which has a rule such that its inverse has the rule ##f^{-1} (h) = g~ker(f)##, which essentially says that ##f^{-1}## maps an element in ##H## to a left-coset of ##ker(f)##. In this light, I am rather confused why they say that ##f## maps between the groups ##G## and ##H##, rather than ##G/g~ker(f)## and ##H##.
I am having a rather difficult time finding such a rule for the epimorphsim ##f##, so that ##f^{-1} (h) = g~ker(f)##.