|
 |
 |
new: SHIFT
 the most difficult puzzle in the world |
last update: jan 25 - 2011 |
 |
 |
| David E. Dirkse |
 |
  |  (x2+y2)(y2+x(x+b))=4axy2 a = 4, b = 5 |
 |
||
 |
| |
| news / history | |
| freeware | |
| games | articles |
| Delphi programming | about this site |
| name | description | size | |
| fonttest | show pixel image of character | program (252kB) | download |
| keystroke | display ASCII codes of key | program (184kB) | download |
| chrcode | display ASCII code of characters | program (184kB) | download |
| Polygon Overlap Calculator | calculate the area of polygons and their overlap |
330kB | specs / download |
| Ranks | systematically generate Combinations,Permutations,Partitions |
268kB | specs / download |
| Graphics- Explorer |
plot / compute / explore / print different types of equations |
484kB | specs / download |
| pinwheel | operate a vintage mechanical calculator | 313kB | descr./ download |
| factor | factorize numbers of up to 18 digits. Compute GCD |
417kB | download |
| lineq | solve systems of 2 to 9 equations use STEP mode to observe step-by-step process with explanation |
303kB | download |
| Euclid | solve equations like Ax + By = C for integers A,B,C,x,y |
244kB | download |
| numbers | convert numbers to/from number systems 2..16 |
233kB | download |
| All freeware : - executes under Windows 95 and up - ships as *.exe file - has no installation procedure - does not change Windows Registry |
| name | description | image | action |
| Peg Solitaire version 2 |
Single Player Puzzle |  |
description/ download |
| Nim Games | 9 Nim games easy to difficult |
 |
description/ download |
| SUDOKU - helper - solver |
assists in solving puzzles |
|
description/ download |
| CANs | - Nim game - 10 levels - hall of fame |
|
play |
| ColorStacks | - 7 levels - hall of fame - global contest |
 |
description download |
| connect4 | - 8 levels - 8 strategies - hall of fame - analyses |
 |
download new version 4.0 algorithm description |
| subject | type | format | |
| about Triangles and Sides .... | plane geometry | HTML | display |
| geometric proofs of trigonometric identities |
geometry | HTML | display |
| calculate Square Root using Pencil and Paper |
arithmetic / algebra | HTML | display |
| Energy Storage | physics / calculus | HTML | display |
| calculate p | algebra | HTML/javascript | display |
| the Ultimate Gutter | calculus | HTML | display |
| calculations in plane geometry |
algebra applications | HTML | display |
| Lissajous Curves in motion | parametric functions | HTML | display |
| the Least Squares method | linear algebra application | HTML | display |
| a CONNECT4 search algorithm | artificial intelligence/ search technique |
HTML | display |
| Formula Translation | programming algorithm | HTML | display |
| subject | type | format | |
| the Direction of a vector | theory + code + exerciser program | HTML / program | display |
| 3D spheres painting | theory + source code | HTML / program | display |
| Flicker free, smooth, painting | theory + source code | HTML / program | display |
| A Microseconds Counter | description + source code | HTML | display |
| Fast Drawing in Delphi | description + source code + program | HTML | display |
| a simple component for color selection |
description + source code | HTML | display |
| resizing Bitmaps | programming algorithm | HTML | display |
| programming the sudoku helper/solver |
Delphi programming | HTML | display |
| exponential curve fitting: y = aebx + c |
calculus application / Delphi programming |
HTML | display |
| solving Ax + By = C | mathematics/ Delphi programming |
HTML | display |
| an ArrayButton Component | Delphi programming | HTML | display |
| your own Dialog Form | Delphi programming | HTML | display |
| FloodFill | programming algorithm/ Delphi programming |
HTML | display |