Changes during 2010 - Interactive Mathematics Miscellany and Puzzles, changes during 2010

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Chronology of Updates

Note

I have placed chronology of updates for 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, and 2009 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.

March 17	Addition and Subtraction Formulas for Sine and Cosine III
March 17	Linear System with Parameter
March 16	Listing All the Composite Numbers
March 16	Lucky Numbers
March 12	Factorial Products
March 11	Function in the Plane That Vanishes
March 10	The Size of a Class: Two Viewpoints
March 9	Less than, Equal to, Greater Than Symbols
March 9	Points Generated by the Nine Points
March 8	Tangent Lines and Circles in Convex Quadrilateral
March 7	The Ballot Lemma
March 5	The Reflection Lemma
March 4	Getting a Scout out of Desert
March 3	Random Walks
March 2	Van Schooten's Locus Problem
March 2	Square out of a Quadrilateral
Feb 27	Diagonal Argument
Feb 25	A Trigonometric Solution to a Difficult Sangaku Problem
Feb 24	A Possibly First Proof of the Concurrence of Altitudes
Feb 24	Patterns in Pascal's Triangle
Feb 23	Construction of Pascal's Triangle
Feb 23	Short Construction of the Geometric Mean
Feb 22	Treatise on Arithmetical Triangle
Feb 19	A Fair Game of Chance
Feb 19	Isosceles Tetrahedron
Feb 13	Concyclic Points in Bride's Chair
Feb 13	Joseph Keech in Bride's Chair
Feb 12	New Proof of Euclid's Theorem
Feb 12	Properties of the Figures in Euclid I.47
Feb 11	Four Crossing Circles
Feb 10	Two Circles on Angle Bisector
Feb 10	Coaxal Circles on Perpendicular Bisector
Feb 6	Equal Chords in Crossing Circles
Feb 6	Parallel Chords in Crossing Circles
Feb 3	Monty Hall Problem Redux
Jan 31	Monty Hall Dilemma's Simulation
Jan 30	The Plain Butterfly Theorem
Jan 29	Proof 18 of the Butterfly Theorem
Jan 28	Unproperty of the Powers of 2
Jan 27	The Local-Global Principle
Jan 25	Infinitude Of Primes From Legendre's Formula
Jan 25	Legendre's Formula
Jan 24	Half Turn, Reflection in Point
Jan 23	Clubs in a Vector Space
Jan 21	Triangulating Squares
Jan 20	A Proof of the Coincidence of Altitudes by W. Chapple (1749)
Jan 19	p-adic Expansions
Jan 18	p-adic Numbers
Jan 18	What Is Space Completion?
Jan 15	Line through a Point in an Angle
Jan 13	Mutually (Jointly) Independent Events
Jan 12	Morley's Trisector Theorem: Proof by R. J. Webster
Jan 12	Morley's Trisector Theorem: Proof by H. D. Grossman
Jan 11	However You Solve It ... A Wonderful Equation
Jan 11	Trigonometry by Paper Folding
Jan 10	Isoperimetric Property of Equilateral Triangles
Jan 10	Maximum Area Property of Equilateral Triangles
Jan 9	Sangaku with Quadratic Optimization
Jan 7	Equilateral Triangle on Parallel Lines
Jan 5	Circles with Equal Collinear Chords
Jan 3	Translated Triangles
Jan 2	Find a Common Chord of Given Length
Jan 1	Equilateral and 3-4-5 Triangles

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