- #1

Mr Davis 97

- 1,462

- 44

So there's a hint, and it tells me first to established that every element in ##G## can be written as ##x^{-1} \sigma (x)## for some ##x \in G##. I have two questions. Why does showing that ##f(x) x^{-1} \sigma (x)## is injective prove the hint, and how could I ever approach this problem without knowing the hint?