European Organization for Nuclear Research

John Jowett's Computing Links




General Computing Sources

Rexx and Kedit



Historical Computing


The people in the category performance-oriented on the contrary, do not at all strive for perfection. Instead they have a need to achieve performance immediately. Such performance leaves no time for intellectual curiosity. Instead, techniques already known to them must be applied to solve problems. To these people, failure is a disaster whose sole feature is to harm instant performance. Similarly, learning represents the possibility of failure and must thus be avoided if possible. To the people in this category, knowledge in other people also represents a threat. As long as everybody around them use tools, techniques, and methods that they themselves know, they can count on outperforming these other people. But when the people around them start learning different, perhaps better, ways, they must defend themselves. Other people having other knowledge might require learning to keep up with performance, and learning, as we pointed out, increases the risk of failure. One possibility for these people is to discredit other people's knowledge. If done well, it would eliminate the need for the extra effort to learn, which would fit very well with their objectives.

Robert Strandh, The psychology of learning

 As I wrote many years ago at the very beginning of the debate about computers, a computer is just a glorified pencil. Einstein once said "my pencil is cleverer than I". What he meant could perhaps be put thus: armed with a pencil, we can be more than twice as clever as we are without. Armed with a computer (a typical World 3 object), we can  perhaps be more than a hundred times as clever as we are without; and with improving computers there need not be an upper limit to this.

     Karl Popper,  The Self and Its Brain, p. 208

The Brain Rot  Dialogue


It is a profoundly erroneous truism, repeated by all copy-books and by eminent people when they are making speeches, that we should cultivate the habit of thinking of what we are doing. The precise opposite is the case, Civilization advances by extending the number of important operations which we can perform without thinking about them. Operations of thought are like cavalry charges in a battle--they are strictly limited in number, they require fresh horses, and must only be made at decisive moments. 

Alfred North Whitehead


Ideas are beginning to appear for equation transformers, which will rearrange the relationship expressed by an equation in accordance with strict and rather advanced logic.  Progress is inhibited by the exceedingly crude way in which mathematicians express their relationships.  They employ a symbolism which grew like Topsy and has little consistency; a strange fact in that most logical field.

A new symbolism, probably positional, must apparently precede the reduction of mathematical transformations to machine processes.

 Vannevar Bush, July 1945

Twistclaimer: I have assembled this page to collect links that I find useful in my work. It reflects the tools I find myself using as well as my personal choices and preferences. The fact that a link appears here should not be construed as an endorsement of a product:  it is equally likely to be there to help me solve frequent problems with it.

You may also be interested in other collections available from my Home Page

Accelerator Physics Programs





(just a procedure for getting it)

Radiation Simulator






 Los Alamos Accelerator Code Group



MAPA from Tech-X


Mathematica Resources 

Beam Optics


Useful sites

Wolfram Research

Wolfram Library

Wolfram Blog 



Search for my postings


Visual Mathematics
(Try the Animated Mathematica Function Visualization!)

Xah: Visual Dictionary of Special Plane Curves

Principia Consulting Does anyone know what happened to this site?

Mathematica Programmer

David Park's Mathematica Page
(nice tutorials! everyone should try  StepbyStepEquations)

 Paul Abbott

Salford Mathematica


Examples from Scientific Arts

Allan Hayes

Mathematica Benchmark Site

Mathematica in CERN (Windows)

Mathematica in CERN (Unix)

Word and MathType



Notes, hints and tips from me

A private collection of rough notes, hints and tips that I have jotted down somewhat randomly.  Many are only useful in CERN. No guarantees of anything concerning this material!

Legacy Computing:

Rexx and Kedit


No-one under 35 years of age should have heard of LaTeX.  Old-timers like me used it in the 1980s and early 90s when it was the best thing around.  Computer technology has advanced since then.  However sometimes one is obliged to use it by certain publishers, so here is what I think is still  most important to know about LaTeX:


CERN Computing Environment


General Computing Sources

Historical Computing

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Updated Tuesday, 26 February, 2008