Number Theory

Catalan's Conjecture (Universitext) by René Schoof

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By René Schoof

Eugène Charles Catalan made his well-known conjecture – that eight and nine are the single consecutive excellent powers of normal numbers – in 1844 in a letter to the editor of Crelle’s mathematical magazine. 100 and fifty-eight years later, Preda Mihailescu proved it.

Catalan’s Conjecture provides this surprising bring about a manner that's obtainable to the complex undergraduate. the 1st few sections of the e-book require little greater than a simple mathematical heritage and a few wisdom of common quantity conception, whereas later sections contain Galois conception, algebraic quantity thought and a small volume of commutative algebra. the must haves, comparable to the elemental proof from the mathematics of cyclotomic fields, are all mentioned in the text.

The writer dissects either Mihailescu’s facts and the sooner paintings it made use of, taking nice care to pick streamlined and obvious models of the arguments and to maintain the textual content self-contained. basically within the facts of Thaine’s theorem is a bit category box idea used; it's was hoping that this program will encourage the reader to review the speculation further.

Beautifully transparent and concise, this ebook will attraction not just to experts in quantity idea yet to someone attracted to seeing the applying of the guidelines of algebraic quantity idea to a recognized mathematical challenge.

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Example text

Hanrot [6]. Recall that saying that the element (x − ζ p )1−ι of H − ⊂ H is trivial means that (x − ζ p )1−ι = α q for some α ∈ Q(ζ p )∗ or, equivalently, x − ζp = αq , x − ι(ζ p ) for some α ∈ Q(ζ p )∗ . Since Q(ζ p ) does not contain any qth roots of unity, the element α is unique. Definition Let x, y ∈ Z be nonzero integers satisfying x p − y q = 1. Suppose that x−ζ (x − ζ p )1−ι = α q for some α ∈ Q(ζ p )∗ . Let w ∈ Q be a qth root of 1−ζ pp and set w = w/α. Then w is a qth root of x−ι(ζ p ) .

We have G = Gal(F(ζl )/Q(ζl )) and ⌬ = Gal(F(ζl )/F). We fix a primitive lth root of unity ζl and a nontrivial character χ from (Z/lZ)∗ to the group of pth roots of unity μ p in Z[ζ p ]∗ . Then we define the Gaussian sum τ by τ =− χ (x)ζlx .

1 (i) implies then that we have θi ∈ J for every i ∈ Z. Since the θi generate the Stickelberger ideal over Z[G], it suffices now to show that J itself is a Z[G]-ideal. 1 (iv). 3 Let p be an odd prime number and G = Gal(Q(ζ p )/Q). (i) The elements f i , for 1 ≤ i ≤ p−1 , together with the G-trace T form a Z-basis 2 for the Stickelberger ideal of Z[G]. (ii) Let I be the ideal of Z[G] that is the product of the Stickelberger ideal by (1−ι). , form a Z-basis for I. 2, the elements f i , for 1 ≤ i ≤ p−1 , together with the 2 G-trace T generate the Stickelberger ideal as a group.

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