D4MATHS

Download html, text and logos of this site.
Navigatethese pages with frames.

PERSONAL MATERIAL

DIVISION BY ZERO IS PAYDIRT

The RSA Security Challenge   asks you to try factorise numbers for money. Over $500000 is on offer. You can attempt this by running various factorisation programs. Look at the NFSNET website to see just how much work is going onto this problem. Some 'kitchen table' methods can be found in factor.txt. and the source scripts are in rsac.d4f . To run these scripts download rna.exe (windows) or math2549.tgz (linux)and run your chosen script. From a command prompt type the following.

d4x test.afn
ld script
ld rsac
rsac

The simplest method involves random guessing. A lucky guess will give an immediate factorisation. The odds of doing this are less far less than your chance of being struck by a meteorite in the next ten seconds. Once you have got your factorisations contact RSA Security via their website for details on submission.

To read more about how this can be done see my diary.

INTERNET EXPLORER and WINDOWS USERS

You may download mathematics software here. Load the file into a new directory and run it. For details of use see install.htm

Recent developments: Linear cellular Automata, and health and nutrition data. Download DNA.EXE to a new folder, and then run it. You will see a scrolling dna molecule. Press CTRL-C when you are bored and you will see some pull down menus. From these you can access the documentation. There is also the full text of the General Public Licence (GPL)

You can download the latest source code and documentation on Windows/Linux compatability and other features. For that matter the file RNA.EXEis almost the same as DNA.EXE, except that there is mouse support, and the application runs a common linux/windows script. 

     To find all the images select 'Shell' from the pull down menus.
     Type the following after the $ prompt.

    ld script
    ld refresh
    server -go -shuffle -size 6000 -b / -delay 12 *.xbm *.gif *.jpg

LINUX USERS

New! ... Download maths software
The most recent version of math2545, is now math2549. C-source code, scripts and documentation are in math2548.tgz. Fonts and a recent d4x binary are in etc.tgz.

  1. math2549.tgz
  2. etc.tgz
  3. recent binary (sept 2006)

DOCUMENTATION FILES

JAVASCRIPT STUFF

Javascript is a prgramming language incorporated into most web browser software. These slide shows are tutorial material.

COMPUTER USE SURVEY

This part is under construction.

CHINESE VIEWER FOR DOS

Download the files from the newsgroup alt.chinese.text.hz and read these files with a DOS machine. A boot disk image is provided. The reader is in the form of a self extracting program containg 16x16 and 24x24 fonts.

Introduction to Life

Conway's Cellular Automata Game
http://www.radicaleye.com/lifepage
This site contains many links. CAs are now getting onto the maths syllabus in many schools and colleges. Various people think that CAs can provide the theory of everything. Although early simulations were practiced on a Go board it is very hard to design a CA to play Go. The 19x19 Go board became obsolete for tracking life generations once people could more easily use computers. Much modern research has been on positions where even a 1024x1024 high resolution display is no longer adequate to display the interesting areas.

GOOGLEBOT SEARCH ENGINE
Observations concerningThree Cats
DON VALLEY VETINARY SUPPLIES

1 0 0 2 10 4 40 92 352 724 ...

This integer sequence comes from the number of ways of placing N mutually non-attacking queens on an NxN chessboard. You can see a the source code of a C program which generates the solutions. Durango Bill's website contains a good description of the problem and tables of values.
  1. nqueens.c source code
  2. Durango Bill's The N-Queens Problem

COUNTDOWN

Countdown is a popular TV program in the UK where contestants solve various puzzles including anagrams, longest word from letters and arithmetic problems. The arithmetic problems take the form of six numbers selected at random from the set 1 2 3 4 5 6 7 10 15 25 50 75 and a terget number between 100 and 999. The object is to combine the six numbers using the four basic arithmetic operations + (plus), - (subtract), * (times) and % (divide), and produce the target number. In the TV program the competitors generally go for the closest number they can find in the half minute or so which they are given.

For example the six numbers 1 5 5 8 25 75 and target 611 would have multiple solutions including

80=5+75 640=80*8 635=640-5 610=635-25 611=610+1
600=8*75 6=1+5 606=600+6 5=25%5 611=606+5
There is a C program which will do an exhaustive search for solutions of this problem. This program uses the N-queens algorithm with N=6. To get the solutions to the above problem run swatter as follows

swatter -x 1 5 5 8 25 75 611
To get a list of all numbers between 100 and 999 which can be expressed using the arithmetic operations +,-,*, and % (divide) run the command line

swatter -x -v 1 5 5 8 25 75 611
Numbers which can be computed will have a non zero index. Impossible numbers will be listed with a zero in the right column.

  1. swatter.c source code
  2. Problem description from Oxford University Computer Science Department
Meet Lily of the Valley
Steve Withington's website
Steve's website contains excellent photos of the Derbyshire Peak District . On the doorsteps of Sheffield and Manchester, the Peak District is Britain's most visited national park.
How the law may affect your computer activities.

Sheffield University 2600 group. ....This page may be unavailable.

Interesting website with some good mathematics pages.

Mark Lewis

European Union Pages.
  1. Enlargement of the European Union
  2. Problems of the European Union

AMERICAN PRESIDENTIAL ELECTIONS 2000

Ralph Nader's campaign was the razor which cut asunder the much hyped Amercan version of democracy. Since the 1890s combinatorial analysis has been used to analyse results from exit polls and rolling counts, while weighted voting systems have been seriously analysed since the inception of the UN Security Council in the 1940s. Mark Livingston of the University of North Carolina has written an excellent theoretical page.

BANZHAF POWER INDEX AND THE ELECTORAL COLLEGE

DENOUNCE THE SINGLE CONVENTION ON NARCOTIC DRUGS

This is one of the more moronic pieces of legislation passed by the 'great and good' of the World. Prohibition was popular in the 1920s in the USA because they wanted to stop drinking, and also in the then colonial world since nationalist leaders in much of Asia were in great emotional pain because of the actions of the British capitalist classes in using Opium to balance the books of their then extensive overses empires. The Japanese control of Opium distribution in China during the 1930s lead to a reinforcement of these opinions.

Despite the UN CONVENTION intravenous drug use is rife in Eastern Europe and many people are catching AIDS/SIDA. The UN CONVENTION is a good example of a "harm maximisation" policy.

Unsign yourself at www.ukcia.org
Your government signed you up to this treaty which requires the possession of a huge list of drugs including cannabis, ecstasy and heroin to be a criminal offence punishable by "imprisonment or other penalties of deprivation of liberty". The British foreign secretary, Robin Cook has been pleased to exhort countries such as Singapore and Malaysia to be yet more vigourous in enforcing these laws despite the fact that the Death Penalty is still fashionable for drug offences in these places.

Visit Mark Lewis website for more details.
More Maths & Politics
A Note on repression of the Palestinian people.

LETTERS OF IRAN

Javid's blog. Please enable farsi language to view this.

Blackpool photos by Javid

Green Party Issues
Are you studying English ? Do you know that many English words have two meanings ? Benjamin Disraeli described England as 'Two Nations' back in the 1840s. With the emergence of English as a global language there are many pitfalls for students. There is 'court' English spoken by the ruling class and then there is people's English. A glossary is provided. Acetone to Zionism

Work at Leverton Gardens
Back to the Top
(none)
(none)