# Lectures on algebraic geometry by Harder G.

By Harder G.

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Extra info for Lectures on algebraic geometry

Example text

We conclude that d is a divisor of r3, ... , r n-1, and finally, of r n. Thus, we just proved that the Euclidean algorithm, when applied to two natural numbers a and b, does yield their greatest common divisor. The greatest common divisor of the numbers a and b will be denoted in what follows by (a, b). Clearly, a is divisible by b if and only if (a, b) = b. As an example, let us find (U20, U15) = (6765,610). 3) is 6765 = 610 . 11 + 55, 610 = 55· 11 + 5, 55 = 5·11. Thus, The fact that the greatest common divisor of two Fibonacci numbers turns out to be another Fibonacci number is not accidental.

Chapter 2 N umber-Theoretic Properties of Fibonacci Numbers 1. We are going to study some properties of Fibonacci numbers related to their divisibility by other numbers. The first result addresses the divisibility of a Fibonacci number by another Fibonacci number. Theorem. If n is divisible by m, then Un is divisible by Urn. Proof. Assume n is divisible by m and set n = mk. We will carry out the proof by induction on k. If k = 1, then n = m, and in this case it is obvious that Un is divisible by Urn.

However, the above mentioned drawback of the Fibonacci numeration sys- tem regarding the bigger capacity provided by the binary system turns out to be a positive feature of the system when it comes to what is called antijamming. Let us point this out as follows. In the binary system, any string of digits represents a certain number. Therefore, an error of any kind - omission or typo - in a string, produces a valid representation of a different number and, therefore, such an error would easily pass undetected.