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Dec 5, 2017 at 22:34 history edited Andreas Rüdinger CC BY-SA 3.0
Thanks to the hint to literature the problem is solved for me
Dec 5, 2017 at 21:50 comment added Andreas Rüdinger @Lee Mosher. Many thanks! I have had a look into Stewart/Tall, Algebraic Number Theory and Fermat's Last Theorem, 3rd edition. Chapter 8 contains more or less what I was looking for. I will study it in more detail. Many thanks again.
Dec 3, 2017 at 21:08 comment added Lee Mosher The geometric properties of norm 1 surfaces, and their interaction with multiplication in the number ring and the number field, are the underlying ideas behind the proof of the Dirichlet units theorem. I like how the book by Stewart and Tall presents these ideas, but I don't know very many textbooks in this field, and I suspect you should be able to find these ideas in any algebraic number theory book
Dec 3, 2017 at 19:29 history edited Andreas Rüdinger CC BY-SA 3.0
Preliminary results for degree 4 added
Nov 27, 2017 at 0:01 answer added Samuel Hambleton timeline score: 4
Nov 26, 2017 at 22:54 comment added Andreas Rüdinger @Stanley Yao Xiao. Many thanks for pointing this out! I will try to have a look at these papers, probably "Higher composition laws I", Annals of Mathematics, 159 (2004), 217-250 is a good starting point.
Nov 26, 2017 at 22:42 history edited Andreas Rüdinger CC BY-SA 3.0
Typo corrected
Nov 26, 2017 at 22:35 comment added Stanley Yao Xiao Have you looked at the Higher Composition Laws papers of Manjul Bhargava?
Nov 26, 2017 at 21:46 history edited j.c. CC BY-SA 3.0
include figures
Nov 26, 2017 at 21:36 history asked Andreas Rüdinger CC BY-SA 3.0