Published on: 2025-06-14 21:38:22
Lemma for FTGT By Susam Pal on 09 Mar 2025 Introduction This post illustrates a key lemma that is used in proving the fundamental theorem of Galois theory (FTGT). Note that FTGT is not covered in this post. The focus of this post is on understanding and proving this lemma only. Here is the lemma from the book Galois Theory, 5th ed. by Stewart (2023): Lemma 12.1. Suppose that \( L/K \) is a field extension, \( M \) is an intermediate field, and \( \tau \) is a \( K \)-automorphism of \( L. \)
Keywords: align phi_1 phi_3 sqrt tau
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