xx/06/2012  Add Equilateral in a square 
xx/05/2012  Correction bugs in JavaSketchpad compiler when empty strings
Add the Gergonne construction Add 2 circles in a rectangle Add Ruler with two parallel edges Add applet in the keep (shifted tower) 
xx/04/2012  My compiler for JavaSketchpad allows input from syntax generated by Declic
Add also the functions for jsp5.jar, and macro creation/edition, a dd accelerator buttons Revision of the help file, update of zip file Bug bowling game with IE when spurious window resizing Palliative : disable JavaScript resizing manager. Consequence : no more granted that a single row is on a single line 
xx/xx/2012  Additions to Soddy points
A few "Sangaku" or alike pb168, pb169, pb170 Add games (bof) : cake of soap, "2012 labyrinth" Add scripts : compositions of objects in heaps, tournaments, Descartes formula 
xx/xx/2011  Miscellaneous corections and additions, the trace of which I don't remeber...
Add scripts : recurrence, equation systems, continued fractions, area of a quadrilateral ... ?) Misc "exercices", and problems : snail on a rubber band etc. 
xx/12/2010  Corrections in Conic sections (wrong contact point in a sketch) 
xx/11/2010 
Script ax + by = c : display details on Euclides algorithm
The well applet and appendix for cutting in three lamb and wolf, chasing in a field. 
xx/10/2010 
pb234 Squares with dominoes
pb235 Folding of a two colour paper sheet Erased square variation by replacing the points by circles (square tangent to 4 given circles), also golden rectangle instead of square. and the same with Erased triangle Construct a triangle with vertices on 3 given lines and sides through 3 given points. 4 rockets problem : add an applet and calculations in general case. 
xx/09/2010 
pb439  Triangle given intersections with circumcircle ...
(translation) Ladder : add a script for calculations 
xx/08/2010 
3D Animations of a cube inside a dodecahedron etc.
Code corrections in pb218 (bisections) and jeu301 (bowling) 
xx/07/2010 xx/06/2010 
Pawns : Sort a string of pawns
and corresponding game Modify the css to hide the top menu when printing Add links in curved dissections and methods and dissection of crescent to square by Gavin Theobald. Add repunits which are multiple of a given number 
xx/04/2010 
Dominoes : Eulerain circuits and domino strings
Constructible intersections of two conic sections Dissections Show of the general methods (to be continued...) 
xx/03/2010 
JavaSketchpad© Compiler :
complete the available objects, add usual color chart, applet parameters...
add exercice Isosceles triangle given inradius and exradius.
add help and examples, classical constructions and tricks add cyclic light paths in a triangle (Fagnano). 
xx/02/2010 
Publication of solution to the goat problem.
Additions to smallest inscribed equilateral triangle. Dissections : 3 squares to one  general case 
xx/01/2010 
Add : Grazing (a tethered goat with 3D constraints)
Additions to Explorer (scripts) for integral stages and delivery Additions to Dissection : three squares with areas 2:3:4 into one with just 7 pieces. Exercice Triangle from relations with angle bisector 
xx/12/2009 
Add : Automodular numbers
Add a script to Taxipaths Complete a fractal Zoo in IFS and in LSystems Exercice Ellipse (from fr.sci.maths) Quadrilateral with half area in a triangle (Hyacinthos) 
xx/11/2009  Add Crossing the bridge at night
Exercice Circle etc. (geometriagon) Add a script to Fibonacci Add reptiles in "bisections" Add topic Fractales 
xx/10/2009  Add Sangaku : three circles in isosceles triangle.
Sangaku again : four circles in equilateral triangle. Powers of 2 beginning by given digits. CayleyMenger determinants, Piero della Francesca formula Exercice Common tangents to a circle and a parabola Script Continued fraction expansion from a Javascript expression / value Game dominoes : add searching a domino Additions to Point in a triangle Add my CV 
xx/09/2009  Add Isogonal : locii of isogonal conjugates.
Changes to Locii : add proofs 
xx/07/2009 xx/08/2009 
Add Straightedge alone : constructions with straightedge.
3 circles in a triangle related locii Additions to Arbelos Typo and language corrections 
xx/06/2009  Add Halfperimeter : segment dividing the triangle perimeter in two.
Add Grèbe : three squares inside a triangle New design of dissections Improve use of collapsing compass in Mascheroni constructions 
xx/05/2009  Add Tilings with irregular pentagons and hexagons
AHA angles add formula and script for general case, 70° case solution. Dissections add square into two squares Update genapp : add show/hide button in the grid macro set scroll to end of field when adding elements Add chords : points at given distance on two circles 
xx/04/2009  Add exercice Segments points equidistant to two segments
Add Pythagorean perimeter Pythagorean triangles with given perimeter or inradius Derviche numbers rotate by multiplication Prepend prepend a 1 to a square to get a square Woodwork cuts of a cube and a prism Digited numbers add 12² + 33² = 1233 
xx/03/2009  Add Proportions points at distances proportional to x:y:z
2 rectangles in a square 2 circles in a triangle 5 circles in a square erased triangle II problem of CramerCastillon Add Bezier (Casteljau construction) Exercices Centroids in a quadrilateral Affine triangle and centers. Translation of projective conic sections Add related projective definitions 
24/02/2009  Add exercice Imaginary intersections with a conic section
Steiner ellipse, triangle 1/7 and triangle 1/4 Easier acces to exercices : direct link from home page and general menu Progressive updates of general menu in pages. However done in index pages. 
5/02/2009  Add script Pythagora find Pythagorean triples with given side 
26/01/2009  Add topic : Mascheroni (compass alone constructions)
Translation of exercices : Squares (construction with squares only)) and problems : Balance of a picture and a floating cube Distances Points at unequal distances Ladder add a variant with a barrel. 
14/01/2009  Adding "exercises" : Triangle 1/7
Triangle C = 2A (Geometriagon) Modifs : Erased square adding an applet Matriochkas other method with fixed points of homography. 
27/12/2008  Correction Pourings (typo and added diagram)
Adding to Diophantine equations : matrices calculations And related script 
19/11/2008  Added : Diophante Script to solve ax+by+cz=d.
JavaSketchpad for the Apollonius constructions, except CCC and trivials. Added "exercices" : Conic section, intersect points of conic sections with straightedge alone. Hyperscalene Most ordinary triangle. Ellipse Minimal ellipse including a given point and ellipse. Quadrilateral Construct a quadrilateral given sides and area. Corrections allready, allways etc... No language change if file doesn't not exist 
/10/2008  Added exercices : Ceva, two sets of parallel or concurrent lines.
7 circles around a 8th. Pb#855 (geometriagon). Some triangle DEF of maximal area. 
25/09/2008  Added : Imperfect squares, tiling a square by squares.
Exercices : Dissect an irregular pentagon into a square. Metric relation in a regular polygon. Minor updates. Correcting a few more "contents". Finished : pba, pbm, pbw, jeux. To do : pbg, themes Replace 'applets' by 'objects' (for Vista and compliance) Finished : pba, pbm, pbw, jeux. To do : pbg, themes Remains to check if codebase are accepted by Vista/IE7 (OK with Firefox). (March 2009) However, doesn't add much to simpler "applet" tag. Won't be generalized. 
9/09/2008  Added problems : construct a Triangle, given some medians/altitudes etc.
A rose, areas in a rose. The fly, the classical problem of the spider and the fly, but in a glass. Correcting a few more "contents" ... (still some). Better ergonomy for language change in index.html. 
21/07/2008  Added problems : Kashikar theorem, line intersecting two circles.
Split a triangle in two parts with same area and same perimeter. Additions to trigonometric relations. Exercice : Kashikar (obsolete) and Polygon, strange relation in a (2n+1)gon. 
7/07/2008  Added problem : Application of Miquel circle to triangle construction
Added exercice : Axis of Parabola by paper folding 
26/06/2008  Added themes : Euler line and circle,
incircle, inversion, polar, Antiparallel Games : domino extended to 9×9 dominoes Added exercices : half disc, tennis balls 
04/06/2008  All problems and topics available and bilingual.
The loops game is now as a Java applet (no more image files) Todo : Complete the unfinished topics (conic sections, incircle) "Search the site" feature Update all description and keywords (and fix the erroneous "contents" into "content") 
xx/05/2008  Creation. Transfer of site to http://mathafou.free.fr
Redesign. Comply with standards (doctypes etc...) Fixed menu on every page, no more frames. No more dynamic link display through Javascript (version.js and renvoi.js) Grouping scripts into scripts and topics into themes. exe000 → exepyth, sol000 → kpytri exe001 → exesumsq2 exe001b → exesumsq4 exe001c → exesumtri exe002a → exediv, sol002 → kdioph exe005 → exedioph, sol005 → kdioph The corresponding solutions solxxx giving just the specific case of the problem posed Rewriting of calculation scripts. No more useless call to server : All results are displayed in DHTML <div>s. Bug fix in exedioph (on arithmetic overflow). All the arithmetic problems are done (bilingual).

Old history of http://chephip.free.fr
With big gaps (site updates without history change)  
xx/07/2006  Add GF8 (tables for graecolatin square of order 8)
Bugs in mail function : bad return Translations : 
xx/05/2006  Improve mail functions.
Add Segment, use of collapsing compass Translations : 
28/04/2006  Extend Napoleon theorem, add a JavaSketchpad
Full solution of Inscribed triangle Add triangle DEF min to Erased triangle Add nested triangles Add socks problem (within the Smith sisters problem) Add Gloves problem Add inverse variant in erased square Translations : Pascal and Brianchon theorems 
31/03/2006  Add 3D constructions
Shliced numbers link to full listing instead of javascript. Hastings description of "English method" Renaldini typo in formula Correction in aeronautic meeting (typo) Translations : the ant, the well, Apollonius 
06/03/2006  Inscribed triangle
Corrected butterfly theorem (typo) Hastings English method description Translations : compass alone, Napoleon problems 
21/02/2006  Cards game, direct call with final rank as parameter.
Translations : Point in a square, point in a triangle. Erased triangle, erased square, Fagnano. 
21/01/2006  Improve Integer triangles Angle A = n×B
All arithmetic problems are now translated. (remains geometry and topics) 
17/12/2005  Add Max triangle II (in ellipse)
Add Handshakes exe002a sum of divisors : accept an expression as input. Translations : divisors, amicable, perfect and Mersenne numbers Dominoe tiling, Pell equation and related, congruent numbers, Aegyptian fractions, ax+by=c, Bézout, Euclid algorithm, coins, bags, sharing and measure, shliced numbers, two numbers, ink splash, incomplete operations, modular arithmetic, alphametics, digited numbers, matches, smurfs, digited square, clock Remains 4 pba (pb0xx), no related new topics, then pba will be complete. Then pbg (31), then remaining of topics (29) 
23/11/2005  Rewrite Explorer entirely.
Add Tetrahedron with integer point. Add Pizza II and improve Pizza (add proof without words) Add Self cube Add Resistors exe001 decomposition as sum of two squares : accept an expression as input. Knight add variants with misc leapers + program in C Translations : a few ... 
26/09/2005  Improve of Loops : colouring the loops, mark the changed parts,
english translation.
Translated : all games all misc problems and related topics 
15/09/2005  Provision for a full bilingual site
But no additional english pages right now ... (Just all the common pages are, and at least one topic in each class, so as to validate the process) Fix a php bug in sending mail : a few isset() missing. 
See French version for old history 