The Wild Wild Web - Learning with tag(s) mathematics

An interactive demo of the Gauss-Seidel method for solving linear equation systems. When and why does it work? And why, when you flip the equations, it suddenly stop working? You can now play and see.

Private Status and Opting Out

2 months ago | Project Euler

Members have always had the option of making their accounts private, which means they will not appear in any public ranked tables, including the fastest solver tables. However, we have now provided an option which allows members to maintain public status, but opt out of individual fastest solver tab [...]

MathJax Changes

3 months ago | Project Euler

The guide to formatting posts has always asked members to use single dollar for inline TeX content and double dollar for block level, but some alternatives were previously supported. For example, it was possible to use \[ and \] delimiters for block level and you were able to add TeX to the page dir [...]

BBCode Update 2025

3 months ago | Project Euler

Over the years the BBCode module used in the problem threads has continued to be modified and have additional tags added. So, to ensure a more streamlined performance, the entire module has been rewritten. Every attempt has been made to support both recent and legacy posts and I have tried my best t [...]

Why learn about the golden-section search

4 months ago | Words and Buttons Online

An interactive demo of bisection search and golden ratio search algorithms. There is also a motivation to learn them both. Spoiler alert! One converges better, and the other has a better computational cost.

Summer Break

5 months ago | Project Euler

The last problem of this academic year will be published on Saturday Aug 02 at 16:00 (UTC). The first problem of the new academic year will be published on Saturday August 30 at 19:00 (UTC).(Friday 06 June 2025: Summer Break)

Award Updates

9 months ago | Project Euler

New awards have been added along with a number of visual tweaks to sections of the Progress pages to support them. Some of them should be obvious, but others might appear a little mysterious. Three Strikes!: Get the diagonals in any three grids Perfect Game: Get the diagonals in all possible grids [...]

A smooth and sharp image interpolation you probably haven't heard of

2 years ago | Words and Buttons Online

An image interpolation that gives us a continuous and smooth image, where every interpolated value only depends on the four neighboring pixel values. The image becomes smooth, but sharp features remain sharp.

The Real C++ Killers (Not You, Rust)

2 years ago | Words and Buttons Online

All the “C++ killers”, even these which I wholeheartedly love and respect like Rust, Julia, and D, help you write more features with fewer bugs, but they don't much help when you need to squeeze the very last FLOPS from the hardware you rent. As such, they don’t have a competitive advantage over C++ [...]

Rational interpolation

2 years ago | Words and Buttons Online

Rational interpolation is a step forward from polynomial interpolation towards rational splines. With rational interpolation, you can build functions that run through a set of points and also have vertical asymptotes whenever you want. With this capability, you can now model functions like logarithm [...]