Download Continued Fractions. by Doug Hensley PDF

By Doug Hensley

The Euclidean set of rules is among the oldest in arithmetic, whereas the examine of persevered fractions as instruments of approximation is going again at the very least to Euler and Legendre. whereas our realizing of persisted fractions and similar equipment for simultaneous diophantine approximation has burgeoned over the process the prior decade and extra, a few of the effects haven't been introduced jointly in booklet shape. persevered fractions were studied from the viewpoint of quantity thought, complicated research, ergodic thought, dynamic techniques, research of algorithms, or even theoretical physics, which has additional complex the location. This booklet areas particular emphasis on endured fraction Cantor units and the Hausdorff measurement, algorithms and research of algorithms, and multi-dimensional algorithms for simultaneous diophantine approximation. vast, appealing computer-generated pictures are offered, and the underlying algorithms are mentioned and made on hand.

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Sample text

If the coefficients are algebraic numbers, and particularly if they are rational, it is possible to carry out the exact computations and implement the algorithm. There is, however, a tendency to computational explosion, as the coefficients become complicated. Another way to determine the successive b^ involves matrices. We begin with po = p and qo = q as before, and we set (P') = (° 1 ^fa-1) As before, bj = B(pj,qj) is t h e unique polynomial b so t h a t deg(pj — bqj) < deg(qj). T h e algorithm terminates when qr = 0.

The intervals corresponding to distinct v £ V[c) are disjoint, and their union is all of [0,1] save for a Cantor dust of measure zero. ) The length of I[v,c] is comparable to l/(c 2 |v| 2 ). The number of integers a so that a/m G /[v, c] is thus 0(1 + m c - 2 | v | - 2 ) . Consider, then, a procedure in which first, all v € V[c] with |v| < yjxjc are listed. There will be on the order of (x/c)^ of these. The real interval [0, m] is dissected into that many intervals in which no a for which K(a, m) < c is to be found, and as many intervals, give or take 1, in which we must search case by case.

This result, and a generalization, goes back to B6hmer[B]. There is a nice proof of the more general result in [AB]. One key tool is an old observation of H. J. S. Smith, Note on continued fractions, Messenger Math. 6 (1876), 1-14. We quote this result from [AB]: Let a be an irrational number with 0 < a < 1. Let a = [0, a\, 0 2 , . . ] and p-n/q-n — [0,a\,a2,.. -an], n > 0, where pn, qn are relatively prime non-negative integers. ) For n > 1, define fa(n) = [(n + l)aj — [na\, and consider the infinite binary sequence fa(n)n>i, which is sometimes called the characteristic sequence of a.

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