By Michal Krizek, Florian Luca, Lawrence Somer, A. Solcova

ISBN-10: 0387218505

ISBN-13: 9780387218502

ISBN-10: 1441929525

ISBN-13: 9781441929525

French mathematician Pierre de Fermat grew to become premiere for his pioneering paintings within the quarter of quantity thought. His paintings with numbers has been attracting the eye of beginner mathematicians for over 350 years. This ebook used to be written in honor of the four-hundredth anniversary of his start and is predicated on a sequence of lectures given by way of the authors. the aim of this booklet is to supply readers with an summary of the numerous homes of Fermat numbers and to illustrate their various appearances and functions in parts similar to quantity conception, chance thought, geometry, and sign processing. This e-book introduces a basic mathematical viewers to easy mathematical rules and algebraic tools attached with the Fermat numbers and should supply precious studying for the beginner alike.

Michal Krizek is a senior researcher on the Mathematical Institute of the Academy of Sciences of the Czech Republic and affiliate Professor within the division of arithmetic and Physics at Charles collage in Prague. Florian Luca is a researcher on the Mathematical Institute of the UNAM in Morelia, Mexico. Lawrence Somer is a Professor of arithmetic on the Catholic collage of the United States in Washington, D. C.

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**Extra resources for 17 Lectures on Fermat Numbers: From Number Theory to Geometry**

**Sample text**

In particular, we can take w = 1. By backward substitution, we successively find that v = 2, Y = 5, and x = 17. Recall that the greatest common divisor and the least common multiple of more than two integers are defined in a similar manner as for two integers by induction, namely, for k > 2 and integers nl,"" nk, we set gcd(nI, ... , nk-I, nk) = gcd(gcd(nl"'" nk - d , nk) if nl f. 0, lcm(nI, ... , nk-I, nk) = lcm(lcm(nl,"" nk-l), nk) if k Il nj f. 0. , 2 t 3). If min and m < n, then m is called a proper divisor of n.

4. Geometric interpretation of congruence modulo 7. The real axis is uniformly rolled up as a h elix on an infinite cylinder. All integers occurring in the same vertical direction are congruent modulo 7. 14 17 lectures on Fermat numbers Let us briefly recall several basic properties of congruence. We immediately see that a == a (mod m) for any integer a. If a == b (mod m), then for any integers a, b, e, and k 2: 0 we immediately have b == a (mod m), a ± e == b ± e (mod m), ae == be (mod m), ak == bk (mod m), where the last congruence follows from the equality From the above we see that the relation "==" modulo m is reflexive and symmetric.

Let Fm be a prime and a an integer. Then every prime Fermat number less than or equal to Fm divides a F = - a. Fk Proof. Let be any prime Fermat number for which 0 ::; k ::; m. First suppose that I a. 14) Fk t a. By Fermat's little theorem, 31 3. 15), The following theorem is mentioned in [Kiss]. 12 (Bolyai). Every Fermat number Fm for m 6n - 1. Proof. We have to show that 6 I Fm Fm + 1. 4), + 1 = FoFl ... Fm - 1 + 3 = 3(F1'" where the number in parentheses is evidently even. 1 we prove a stronger result.

### 17 Lectures on Fermat Numbers: From Number Theory to Geometry by Michal Krizek, Florian Luca, Lawrence Somer, A. Solcova

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