My Math Forum Proving that $Gal(L/F)\overset{∼}{=}N_G(H)/H$

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 January 16th, 2018, 01:12 AM #1 Senior Member   Joined: Jan 2015 From: usa Posts: 101 Thanks: 0 Proving that $Gal(L/F)\overset{∼}{=}N_G(H)/H$ Please help me to answer this problem: Let $F \subset E$ be a Galois extension and $L$ be a subfield of $E$ containing $F$. Let $G= Gal(E/F)$ and $H =Gal(E/L)$. Show that $Gal(L/F)\overset{∼}{=}N_G(H)/H$.(Note that this is a generalization of one part of the FTGT, which adresses the case where $H ⊴ G$) Thanks

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