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Manifesto: what CTK is about Buying a book is a commitment to learning Table of content Things you can find on CTK Chronology of updates Email to Cut The Knot Recommend this page

Chronology of Updates

Note

I have placed chronology of updates for 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 and 2008 into separate files. Starting with 1997, the most recent entries appear topmost. Besides providing an insight into this site's evolution, chronology of updates may be used for word searches.

July 2 Structure of Hyperreal Numbers
June 29 One Dimensional Ants
June 19 What Is Demagoguery?
June 17 Hyperintegers and Hyperreal Numbers
June 9 Models and Metamathematics
June 5 Fibonacci's Quickies
June 1 May the Product of Planes Be a Sphere?
May 31 Dollars in Pockets
May 31 One Trigonometric Formula and Its Consequences
May 29 Bimedians in a Regular Tetrahedron
May 29 Two Parallels in a Triangle and One More
May 28 Clifford Algebras
May 27 A better solution to a difficult sangaku problem
May 27 A Restored Sangaku
May 26 Probability of Divisibility
May 26 Product of Simple Fractions
May 26 IMO 2007, Problem 2, solution by Vo Duc Dien
May 25 Sum of Squares in Equilateral Triangle
May 21 Bisection of Yin and Yang
May 19 Counting Squares in a Square
May 15 A Review of Pythagoras' Revenge by Arturo Sangalli
May 15 A Line in a Square Grid
May 14 Two Color Coloring of the Plane
May 11 Two Sangaku with Equal Incircles
May 8 Formal Systems - an Example
May 5 GCD(M, N) × LCM(M, N) = M × N
May 4 What Is Fraction?
May 3 Fraction Comparison
Apr 29 Gödel's Incompleteness Theorem
Apr 29 Theories and Proofs
Apr 28 Morley's Theorem, Proof by R. Smyth
Apr 27 Napoleon's Theorem via Two Rotations
Apr 26 Morley's theorem, Proof by Nolan L Aljaddou
Apr 23 Möbius' Strip
Apr 11 Intuitive Probability
Apr 10 Dawson's Kayles
Apr 10 Dawson's Chess
Apr 3 On the Games of Hex and Y
Apr 3 Infinitesimals. Non-standard Analysis
Apr 2 Infinitude of Primes - A Topological Proof without Topology
Apr 1 A Triangle of Antreas Hatzipolakis
Mar 31 Six Concyclic Points II
Mar 30 Solutions to the Third Millennium Olympiad
Mar 29 Grebe: from Ladies' Diary to Carroll's Pillow
Mar 25 A Parallelogram in Triangle
Mar 24 Is Every Trapezoid Parallelogram?
Mar 23 On the Difference of Areas
Mar 21 Matrix Groups
Mar 18 Number 8 Is Interesting
Mar 14 Iterations on a Circle Through Three Points
Mar 14 Pigeonhole in Clubs
Mar 8 Angles in a Cube III
Mar 7 Squares in Circles
Mar 7 Circles with Tangent Diameters
Mar 3 Four Hinged Squares: using complex numbers
Feb 28 Minesweeper Theorem
Feb 20 Proof 19 of irrationality of 2
Feb 17 Angles in a Cube I
Feb 17 Angles in a Cube II
Feb 12 Pascal: Necessary and Sufficient
Feb 6 Butterflies in Hyperbola
Feb 4 Problem 5 from IMO 2004
Feb 4 Morley's theorem, a proof by B. Stonebridge
Feb 2 Urquhart's theorem - From Leningrad Mathematical Olympiad
Jan 31 An Inequality for Grade 8
Jan 30 Proof 81 of the Pythagorean theorem
Jan 29 Morley's theorem, B. Bollobás' proof
Jan 27 Stereographic Projection
Jan 23 Problem 1 from IMO 2006
Jan 20 Irrationality of 2, Proof #14 and Proof #8''
Jan 18 Tangent Circles and an Isosceles Triangle II
Jan 17 Problem 4 from IMO 2007, Solution VII
Jan 16 Three Pyramids are Better Than Two
Jan 15 Orthocenter and Three Equal Circles
Jan 14 Equal Circles, Medial Triangle and Orthocenter
Jan 13 Cut the Cube
Jan 13 Cut the Cylinder
Jan 11 Cut the Cone
Jan 8 Between Major and Minor Circles
Jan 6 An Interesting Example of Angle Trisection by Paperfolding
Jan 5 Fundamental Theorem of Algebra: A Simple Complex Analysis Proof and An Advanced Calculus Proof
Jan 3 Irrationality of 2, Proof #17, Proof #18, Proof #19
Jan 2 Construction of Conics from Pascal's Theorem
Jan 1 Irrationality of 2, Proof #16

Copyright © 1996-2009 Alexander Bogomolny

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