WISKUNDE links

• Number Theory
  • Keith Conrad, Pell's equation I
  • Keith Conrad, Pell's equation II
  • Keith Conrad, Negation and inversion of continued fractions
  • Keith Conrad, The congruent number problem
  • Keith Conrad, Factoring in Quadratic Fields
  • N.C. Ankeny, Sums Of Three Squares
  • A.F. Beardon, Sums of Powers of Integers
  • Z.I. Borevich and I.R. Shafarevich Number Theory (1966)
  • Wikipedia Periodic continued fraction
  • Pankaj Kumar Sharma Pell's Equation
  • Binary Quadratic Forms
  • Hendrik W. Lenstra, Jr, Solving the Pell equation
  • Ronald van Luijk, An Elliptic K3 surface associated to Heron triangles
  • Kimball Martin, The Pell equation
  • Alexandre Junod: An Algorithm to Solve a Pell Equation
  • L.M. Hugenholz, De geschiedenis van de vergelijking van Pell
  • L'ubomíra Balková, Aranka Hrusková, Continued Fractions of Quadratic Numbers
  • Souad I. Mugassabi and Fatima F. Abdullah, The Addition and Subtraction Operations for two Continued Fractions
  • Seung Hyun Yang, Continued Fractions and Pell's Equation.
  • P.J. Rippon and H. Taylor, Even and Odd Periods in Continued Fractions of Square Roots.
  • Francesca Aicardi, The continued fractions of the square roots of integers: on the parity of the length of their period
  • Balazs Szendroi, Cubic Curves: a short survey
  • David Loeffler, Elliptic Curves
  • Paul Yiu, Heron triangles which cannot be decomposed into two integer right triangles
  • N.N., How to Transform a Cubic (With a Rational Point) into Weierstrass Normal Form
  • NUMBERS APLENTY, interesting natural numbers and their properties
  • M.C.van Hoorn, Cryptologie en de Riemann-hypothese
• (Finite) Geometry
  • Wikipedia, Regular polytope
  • Wikipedia, Fano plane
  • S.E.Payne and J.A. Thas, Finite Generalized Quadrangles
  • TUE (bouwkunde), (Chapter 3) Quadratic curves, quadratic surfaces
  • Pauline Ruegg-Reymond, Classification of Quadratic Surfaces
  • Wolfgang Ziller, Quadric surfaces
  • Chris van Tienhoven, Encyclopedia of Quadri-Figures (EQF)
  • Dick Klingens, Kwadreerbare maantjes
  • Peter J. Cameron, Regular polytopes
  • Nan Star Polytopes, Regular star polytopes
• Basics
  • P. Stevenhagen, Algebra I
  • P. Stevenhagen, Algebra II
  • P. Stevenhagen, Algebra III
  • P. Stevenhagen, Number Rings
  • P. Stevenhagen, The arithmetic of number rings
  • A v.d. Essen & B. Souvignier, Lineaire algebra 1. Instituut WiNSt Radboud Universiteit Nijmegen
• Books
  • David E. Joyce, Euclid's Elements
  • Dick Klingens: De Elementen van Euclides
• Finite Geometry
• Diversen
  • Universiteit Leiden, Science faculty.
  • NGL, Natuurwetenschappelijk Gezelschap Leiden
  • Robin J. Wilson, Introduction to Graph Theory, Fourth Edition, Longman
  • Hanneke Paulssen, Lineaire Algebra en Vector Analyse. 11. Toepassingen vectorrekening, gradiënt, divergentie, rotatie. Universiteit Utrecht
  • J. Malkevitch, Finite Geometries?, AMS
  • n-Cube
  • N.G. de Bruijn Set!
  • J.P. Hogendijk, Kegelsneden in de Grieks oudheid
  • N.J. Wildberger, Rational Trigonometry Site
  • MATH+ Advent Calendar
  • DIAMANT
  • Nederlands Mathematisch Congres
  • Platform Wiskunde Nederland
  • N.S. Nagaraj & K.N. Raghaven: Quadratic fields
  • S. Jonker: Hyperbolic geometry
  • L. Euler: On numbers which are the sum of twe squares
  • Bosma e.a.: Continued Fractions
  • Seung Hyun Yang: Continued Fractions and Pell's Equation
  • OEIS
  • Cornell University: Mathematics archive
  • Cut the Knot
  • Killersudoku
  • J.H. Silverman: An Introduction to the Theory of Elliptic Curves
  • C.W.H.Lam: The Search for a Finite Projctive Plan of Order 10
  • K. Rubin: Right triangles and elliptic curves
  • Curves and Surfaces
  • F. Oort: Congruente getallen
  • K.E.Morrison: Congruent numbers
  • J. Top & N. Yui: Congruent number problems and their variants
  • P. Breiding & B. Sturmfels & S. Timme: 3264 Conics in a Second
  • C. Lawson: Exactly how bad is the 13 times table?
  • W. Duke: Rational points on the sphere