Abstract
It is well-known that a continued fraction may be regarded as a sequence of Möbius maps. In this partly expository paper we consider continued fractions by examining the action of Möbius maps in hyperbolic space, and in all dimensions. We obtain a general version of the Stern-Stolz theorem valid in all dimensions, and we draw comparisons between the theory of continued fractions and the theories of discrete groups of Möbius maps, and complex dynamics.
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W. Abikoff, The bounded model for hyperbolic 3-space and a quaternionic Uniformization Theorem, Math. Scand. 54 (1984), 5–16.
B. Aebischer, The limiting behaviour of sequences of Möbius transformations, Math. Zeit. 205 (1990), 49–59.
B. Aebischer, Stable convergence of sequences of Möbius transformations, in: Computational Methods and Function Theory (CMFT ’94), eds. R. M. Ali, St. Ruscheweyh and E. B. Saff, World Scientific Pub. Co., 1995, 1–21.
L. V. Ahlfors, Hyperbolic motions, Nagoya Math. J. 29 (1967), 163–166.
L. V. Ahlfors, Möbius Transformations in Several Dimensions, Univ. Minnesota Lecture Notes, Minnesota, 1981.
L. V. Ahlfors, On the fixed points of Möbius transformations in Rn, Ann. Acad. Sci. Fenn. Ser. A. 1. Math. 10 (1985), 15–27.
L. V. Ahlfors, Möbius Transformations and Clifford Numbers, in Differential Geometry and Complex Analysis, eds. I. Chavel, and H.M. Farkas, Springer-Verlag, Berlin (1985), 65–73.
L. V. Ahlfors, Clifford numbers and Möbius transformations in Rn, Clifford algebras and their applications in mathematical physics, (Canterbury, 1985), 167–175, NATO Adv. Sci. Inst. Ser. C Math. Phy. Sci., 183, Reidel, Dordrecht, 1986.
L. V. Ahlfors, Möbius transformations in Rn expressed through 2 × 2 matrices of Clifford numbers, Complex Variables Theory Appl. 5 (1986), 215–224.
I. N. Baker and P. J. Rippon, Towers of exponents and other composite maps, Complex Variables 12 (1989), 181–200.
A. F. Beardon and B. Maskit, Limit points of Kleinian groups and finite-sided fundamental polyhedra, Acta Math. 132 (1974), 1–12.
A. F. Beardon, The Geometry of Discrete Groups, Springer-Verlag, 1983.
A. F. Beardon and J. B. Wilker, The norm of a Mobius transformation, Math. Proc. Camb. Phil. Soc. 96 (1984), 301–308.
A. F. Beardon, Iteration of Rational Functions, Springer-Verlag, 1991.
A. F. Beardon, The geometry of Pringsheim’s continued fractions, Geometriae Dedicata 84 (2001), 125–134.
A. F. Beardon and D. Minda, Sphere-preserving maps in inversive geometry, Proc. Amer. Math. Soc. 130 (2002), 987–998.
A. F. Beardon, T. K. Carne, D. Minda, and T. W. Ng, Random iteration of analytic maps, to appear in Ergodic Th. & Dyn. Systems.
A. F. Beardon and L. Lorentzen, Continued fractions and restrained sequences of Möbius maps, to appear in Rocky Mount. J. Math..
A. F. Beardon, Continued fractions, Möbius transformations and Clifford algebras, to appear in Bull. London Math. Soc.
A. F. Beardon, The Hillam-Thron Theorem in higher dimensions, to appear in Geom. Dedicata.
A. F. Beardon, Repeated compositions of analytic maps, to appear in Comp. Methods and Function Theory.
A. F. Beardon, The pointwise convergence of Möbius maps, preprint, 2002.
R. Benedetti and C. Petronio, Lectures on hyperbolic geometry, Universitext, Springer-Verlag, 1992.
C. Cao and P. L. Waterman, Conjugacy invariants of Möbius groups, Quasiconformal mappings and analysis (Ann Arbor, MI, 1995), Springer, New York, 1998, 109–139.
L. Carleson and T. W. Gamelin, Complex Dynamics, Springer-Verlag, 1993.
S. S. Chen and L. Greenberg, Hyperbolic spaces, in: Contributions to Analysis, eds L. V. Ahlfors, I. Kra, B. Maskit, and L. Nirenberg, Academic Press, 1974.
H. S. M. Coxeter, Inversive distance, Ann. Mat. Pura Appl. 71 (1966), 73–83.
H. S. M. Coxeter, The inversive plane and hyperbolic space, Hamburger Math. Abh. 29 (1966), 217–242.
H. S. M. Coxeter, The Lorentz group and the group of homographies, Proc. Intern. Conf. Theory of Groups (Canberra 1965), Gordon and Breach, New York, 1967.
H. Davenport, The Higher Arithmetic, Sixth Edn, Cambridge Univ. Press, 1995.
J. D. de Pree and W. J. Thron, On sequences of Moebius transformations, Math. Zeit. 80 (1962), 184–193.
J. Dieudonné, Treatise on Analysis, Vol II, Academic Press, 1970.
P. Du Val, Homographies, Quaternions and Rotations, Clarendon Press, Oxford, 1964.
W. Fenchel, Elementary Geometry in Hyperbolic Space, De Gruyter Studies in Mathematics 11, de Gruyter, 1989.
L. R. Ford, A geometrical proof of a theorem of Hurwitz, Proc. Edinburgh Math. Soc. 35 (1917), 59–65.
L. R. Ford, Rational approximations to irrational complex numbers, Trans. Amer. Math. Soc. 19 (1918), 1–42.
L. R. Ford, Fractions, Amer. Math. Monthly 45 (1938), 586–601.
L. R. Ford, Automorphic functions, Chelsea Pub. Co., Second Edition, 1951.
F. W. Gehring and G. J. Martin, The Matrix and Chordal Norms of Möbius Transformations, Complex Analysis, Birkhäuser, Basel, 1988, 51–59.
F. W. Gehring and G. J. Martin, Inequalities for Möbius transformations and discrete groups, J. Reine Angew. Math. 418 (1991), 31–76.
J. Gill, Infinite compositions of Möbius transformations, Trans. American Math. Soc. 176 (1973), 479–487.
P. G. Gormley, Stereographic projection and the linear fractional group of transformations of quaternions, Proc. Royal Irish Acad. Sect A 51 6 (1947), 67–85.
L. Greenberg, Discrete subgroups of the Lorentz group, Math. Scand. 10 (1962), 85–107.
W. R. Hamilton, On continued fractions in quaternions, Phil. Mag., iii (1852), 371–373; iv (1852), 303; v (1853), 117–118, 236–238, 321–326.
W. R. Hamilton, On the connexion of quaternions with continued fractions and quadratic equations, Proc. Royal Irish Acad. 5 (1853), 219–221, 299–301.
P. Henrici, Applied and Computational Complex Analysis, Vol. 2, Special Functions, Integral Transforms, Asymptotics and Continued Fractions, Wiley, New York, 1977.
K. L. Hillam and W. J. Thron, A general convergence criterion for continued fractions K(a n/b n), Proc. Amer. Math. Soc. 16 (1965), 1256–1262.
L. Jacobsen, General convergence of continued fractions, Trans. Amer. Math. Soc. 294 (1986), 477–485.
L. Jacobsen and W. J. Thron, Limiting structures for sequences of linear fractional transformations, Proc. Amer. Math. Soc. 99 (1987), 141–146.
L. Jacobsen, Nearness of continued fractions, Math. Scand. 60 (1987), 129–147.
W. B. Jones and W. J. Thron, Continued Fractions: Analytic Theory and Applications, Encyclopedia of Mathematics and its Applications, 11, Addison-Wesley, Reading, Mass, (1980). Now distributed by Cambridge Univ. Press, New York.
I. L. Kantor and A. S. Solodovnikov, Hypercomplex Numbers, Springer-Verlag, 1989.
R. E. Lane, The convergence and values of periodic continued fractions, Bull. Amer. Math. Soc. 51 (1945) 246–250.
L. Lorentzen, Compositions of contractions, J. Comput. Appl. Math. 32 (1990), 169–178.
L. Lorentzen and H. Waadeland, Continued Fractions and Some of its Applications, North-Holland, 1992
L. Lorentzen, The closure of convergence sets for continued fractions are convergence sets, Proc. Ednburgh Math. Soc., 37 (1993), 39–46.
L. Lorentzen, Divergence of continued fractions related to hypergeometric series, Math. Comp. 62 (1994), 671–686.
L. Lorentzen, A Convergence Property for Sequences of Linear Fractional Transformations, Continued fractions and orthogonal functions (Loen, 1992), 281–304, Lecture Notes in Pure and Appl. Math., 154, Dekker, New York, 1994.
L. Lorentzen, A convergence question inspired by Stieltjes and by value sets in continued fraction theory, J. Comp. Appl. Math. 65 (1995), 233–251.
L. Lorentzen, Convergence of compositions of self-mappings, Ann. Univ. Marie Curie Sklodowska A 53 13 (1999), 121–145.
M. Mandell and A. Magnus, On Convergence of Sequences of Linear Fractional Transformations, Math. Zeit. 115 (1970), 11–17.
J. W. Magnus, Non-Euclidean Tessselations and their Groups, Academic Press, 1974.
J. Milnor, Hyperbolic geometry — the first 150 years, Bull. Amer. Math. Soc. 6 (1982), 9–24.
P. J. Nicholls, The Ergodic Theory of Discrete Groups, London Math. Soc. Lectures Notes 143, Camb. Univ. Press, 1989.
J. F. Paydon and H. S. Wall, The continued fraction as a sequence of linear transformations, Duke Math. Jour. 9 (1942), 360–372.
G. Piranian and W. J. Thron, Convergence properties of sequences of linear fractional transformations, Michigan Math. J. 4 (1957), 129–135.
O. Perron, Die Lehre von den Kettenbrüchen, Band I, Teubner, Stuttgart, 1954.
O. Perron, Die Lehre von den Kettenbrüchen, Band II, Teubner, Stuttgart, 1957.
I. R. Porteous, Topological Geometry, Van Nostrand, 1969.
J. G. Ratcliffe, Foundations of hyperbolic manifolds, Graduate Texts 149, Springer-Verlag, 1994.
D. E. Roberts, On a representation of vector continued fractions, J. Comput. Appl. Math. 105 (1999), 453–466.
H. Schwerdtfeger, Moebius transformations and continued fractions, Bull. Amer. Math. Soc. 52 (1946), 307–309.
T. J. Stieltjes, Recherches surles fractions continues, Ann. Fac. Sci. Toulouse, 8J (1894), 1–122; 9A (1894), 1–47; Oeuvres, 2, 402–566.
N. Steinmetz, Rational Iteration, De Gruyter Studies in Mathematics 16, de Gruyter, 1993.
W. J. Thron, Convergence regions for continued fractions and other infinite processes, Amer. Math. Monthly 68 (1961), 734–750.
W. J. Thron, Convergence of Sequences of Linear Fractional transformations and of Continued Fractions, J. Indian Math. Soc. 27 (1963), 103–127.
W. J. Thron and H. Waadeland, Convergence questions for limit periodic continued fractions, Rocky Mountain J. Math. 11 (1981), 641–657.
W. J. Thron and H. Waadeland, Modifications of continued fractions, a survey, Analytic theory of continued fractions (Loen, 1981), 38–66, Lecture Notes in Math.. 932, Springer, Berlin-New York, 1982.
W. J. Thron, Continued fraction identities derived from the invariance of the crossratio under l.f.t., Analytic theory of continued fractions, III (Redstone, CO, 1988), 124–134, Lecture Notes in Math., 1406, Springer, Berlin, 1989.
H. Waadeland, Tales about tails, Proc. Amer. Math. Soc. 90 (1984), 57–64.
M. Wada, Conjugacy invariants of Möbius transformations, Complex Variables Theory Appl. 15 (1990), 125–133.
H. S. Wall, Continued fractions and cross-ratio groups of Cremona transformations, Bull. Amer. Math. Soc. 40 (1934), 587–592.
H. S. Wall, Analytic Theory of Continued Fractions, Chelsea Pub. Co., 1948.
P. Waterman, Möbius transformations in several dimensions, Adv. Math. 101 (1993), 87–113.
J. B. Wilker, Inversive geometry, in: The Geometric Vein, eds. C. Davis, B. Grünbaum and F. A. Scherk, Springer-Verlag, 1981, 379–442.
P. Wynn, Continued fractions whose coefficients obey a non-commutative law of multiplication, Arch. Rational Mech. Anal. 12 (1963), 273–312.
P. Wynn, Vector continued fractions, Linear Algebra Appl. 1 (1968), 357–395.
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Beardone, A.F. Continued Fractions, Discrete Groups and Complex Dynamics. Comput. Methods Funct. Theory 1, 535–594 (2001). https://doi.org/10.1007/BF03321006
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DOI: https://doi.org/10.1007/BF03321006