GNU Data Language (GDL) is a free/libre/open source incremental compiler compatible with IDL and to some extent with PV-WAVE. Together with its library routines it serves as a tool for data analysis and visualization in such disciplines as astronomy, geosciences and medical imaging. GDL is free software licensed under the GPL. GDL is developed by an international team of volunteers led by Marc Schellens - the project's founder

The Endeavour
The blog of John D. Cook

This is a special collection of problems that were given to select applicants during oral entrance exams to the math department of Moscow State University. These problems were designed to prevent Jews and other undesirables from getting a passing grade. Among problems that were used by the department to blackball unwanted candidate students, these problems are distinguished by having a simple solution that is difficult to find. Using problems with a simple solution protected the administration from extra complaints and appeals. This collection therefore has mathematical as well as historical value.

Narcissistic numbers are numbers that are 'in love with themselves'. Madachy (1966) defines them as numbers that "are representable, in some way, by mathematically manipulating the digits of the numbers themselves".

MathJax is an open source JavaScript display engine for mathematics that works in all modern browsers.

"Mathematics is the body of sound knowledge centered on such concepts as quantity, music, structure, space, and change – and also the academic discipline that studies them. Mathematics is the first stage of this concept on the academic disciplines of classic house, rhythmic noise, industrial jazz, acid house, ragtime electronics, new age, ambient and classical structures." – J. Moss

In the late 1960s British mathematician John Conway invented a virtual mathematical machine that operates on a two-dimensional array of square cell. Each cell takes two states, live and dead. The cells’ states are updated simultaneously and in discrete time. A dead cell comes to life if it has exactly three live neighbours. A live cell remains alive if two or three of its neighbours are alive, otherwise the cell dies. The Conway’s Game of Life became the most programmed solitary game and the most known cellular automaton. The book brings together results of forty years of study into computational, mathematical, physical and engineering aspects of the Game of Life cellular automata.

Anyone who works with LaTeX knows how time-consuming it can be to find a symbol in symbols-a4.pdf that you just can't memorize. Detexify is an attempt to simplify this search.

This book covers the main topics concerned with interpolation and approximation by polynomials. This subject can be traced back to the precalculus era but has enjoyed most of its growth and development since the end of the nineteenth century and is still a lively and flourishing part of mathematics. In addition to coverage of univariate interpolation and approximation, the text includes material on multivariate interpolation and multivariate numerical integration, a generalization of the Bernstein polynomials that has not previously appeared in book form, and a greater coverage of Peano kernel theory than is found in most textbooks. There are many worked examples and each section ends with a number of carefully selected problems that extend the student's understanding of the text.

This textbook, pitched at the advanced-undergraduate to beginning-graduate level, focuses on mathematical topics of relevance in contemporary physics that are not usually covered in texts at the same level. Its main purpose is to help students appreciate and take advantage of the modern trend of very productive symbiosis between physics and mathematics. Three major areas are covered: (1) linear operators; (2) group representations and Lie algebra representations; (3) topology and differential geometry.

We go through the many considerations involved in fitting a model to data, using as an example the fit of a straight line to a set of points in a two-dimensional plane. Standard weighted least-squares fitting is only appropriate when there is a dimension along which the data points have negligible uncertainties, and another along which all the uncertainties can be described by Gaussians of known variance; these conditions are rarely met in practice. We consider cases of general, heterogeneous, and arbitrarily covariant two-dimensional uncertainties, and situations in which there are bad data (large outliers), unknown uncertainties, and unknown but expected intrinsic scatter in the linear relationship being fit. Above all we emphasize the importance of having a "generative model" for the data, even an approximate one. [...]

Qosmic is graphical interface for creating, editing, and rendering flam3 fractal images. The electricsheep screen saver has been gaining popularity, and Qosmic was developed to provide a Qt interface for people interested in creating and contributing sheep.

Nature 464, 165 (11 March 2010) | doi:10.1038/464165a; Published online 10 March 2010 (RESTRICTED)

BOOK REVIEWED-Perfect Rigor: A Genius and the Mathematical Breakthrough of the Century
by Masha Gessen
Houghton Mifflin Harcourt: 2009. 256 pp. $26

Nature 427, 388-389 (29 January 2004) | doi:10.1038/427388a (restricted)

A reclusive Russian claims to have solved a century-old mathematical problem — but his enigmatic personality is adding a fresh dimension to the proof-checking process. Emily Singer reports.

This is a collection of movie clips in which Mathematics appears. I'm collecting DVDs and VHS tapes of such movies. This is a working document to be extended over time. I started this page during spring break 2006. See also the page "Begin of lectures in college teaching" and "End of lectures in college teaching" and "Examples of good talks". To see the movies larger, to see it on the iphone or include it ina presentation, chose the quicktime ipod version, which are files with .m4v extension. (Media RSS link).

The purpose of this book is to provide an introduction to the concepts of statistical analysis of data for students at the undergraduate and graduate level, and to provide tools for data reduction and error analysis commonly required in the physical sciences. The presentation is developed from a practical point of view, including enough derivation to justify the results, but emphasizing methods of handling data more than theory. The text provides a variety of numerical and graphical techniques. Computer programs that support these techniques will be available on an accompanying website in both Fortran and C++.

"Geometry and Physics" addresses mathematicians wanting to understand modern physics, and physicists wanting to learn geometry. It gives an introduction to modern quantum field theory and related areas of theoretical high-energy physics from the perspective of Riemannian geometry, and an introduction to modern geometry as needed and utilized in modern physics.

Ekee produces images interactively from LaTeX expressions. Drag and drop in several common formats (PNG, SVG, PDF, EPS) to other applications is supported. Ekee can reopen the equations it has created in PNG format. It is free software, released under the GPL.

Wer als Schüler, Student, Ingenieur oder Wissenschaftler Datenreihen und mathematischen Funktionen darstellen will und über elementare Python-Kenntnisse verfügt, der sollte sich diesen Artikel einmal genauer ansehen.

EpsTk stands for "Encapsulated PostSript Toolkit". The codebase consists of pure M-files (Octave or MATLAB script files), which may be used to create most standard 2D scientific graphics (line charts, bar charts, polar plots, contour plots, etc.). The M-files write EPS files.

SM is a plotting programme written by Robert Lupton (

The gathering and analysis of experimental data are fundamental activities in science and engineering. Mathematica in the Laboratory is a hands-on guide which shows how to harness the power and flexibility of Mathematica in the control of data-acquisition equipment and the analysis of experimental data. It is fully compatible with Mathematica 3.0. Many practical examples are given, which can either be used directly or adapted to suit a particular application. The book sets out clearly how Mathematica can provide a truly unified data-handling environment, and will be invaluable to anyone who collects or analyzes experimental data, including astronomers, biologists, chemists, mathematicians, geologists, physicists, and engineers.

Ruskeepaa gives a general introduction to the most recent versions of Mathematica, the symbolic computation software from Wolfram. The book emphasizes graphics, methods of applied mathematics and statistics, and programming. Mathematica Navigator can be used both as a tutorial and as a handbook. While no previous experience with Mathematica is required, most chapters also include advanced material, so that the book will be a valuable resource for both beginners and experienced users.

How do you spark off an interest in maths when the curriculum seems dreary? It's all about mystery, big stories and journeys to infinity and beyond, says Marcus du Sautoy

Introduction The least square method---a very popular technique---is used to compute estimations of parameters and to fit data. It is one of the oldest techniques of modern statistics as it was first published in 1805 by the French mathematician Legendre in a now classic memoir. But this method is even older because it turned out that, after the publication of Legendre's memoir, Gauss, the famous German mathematician, published another memoir (in 1809) in which he mentioned that he had previously discovered this method and used it as early as 1795.

Russische Seite mit haufenweise "kopierter" Fachliteratur... Hat gerade meinen Tag gerettet, das die Bibliotheken über das verlängerte WE geschlossen sind :-)

The Mandelbrot Set is one of my hobbies, and I have collected a large amount of information about it. To organize that information I have created Mu-Ency, a large collection of text files linked to each other.

The fourteen chapters of this book cover the central ideas and concepts of chaos and fractals as well as many related topics including: the Mandelbrot set, Julia sets, cellular automata, L-systems, percolation and strange attractors. This new edition has been thoroughly revised throughout. The appendices of the original edition were taken out since more recent publications cover this material in more depth. Instead of the focussed computer programs in BASIC, the authors provide 10 interactive JAVA-applets for this second edition.

nützlich für Nachilfe

The Online Encyclopaedia of Mathematics is the most up-to-date and comprehensive English-language graduate-level reference work in the field of mathematics today. This online edition comprises more than 8,000 entries and illuminates nearly 50,000 notions

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