## Margaret Bridge

Red flags on Margaret Bridge (Margit híd in Hungarian), Budapest, Hungary. read more

Red flags on Margaret Bridge (Margit híd in Hungarian), Budapest, Hungary. read more

After trying to explain how to correctly add color to a QR code, I went all the way and implemented a QR code generator that actually does this in practice. **Go to the tool.** At this time, the tool is limited to adding a logo or image. read more

The concept of a fractal dimension is based on the idea of measuring things with differently sized rulers, as already mentioned in the article on the Mandelbrot Mandelbrot set. Mathematically (but very loosely), the fractal dimension is defined as: if I cover an object with… read more

The Mandelbrot set is named after Benoît Mandelbrot, a French American mathematician. The set is a part of the complex plane. It is created by iterating the complex quadratic polynomial \(f_c(z)=z^2+c\). For each point \(c\) of the complex plane… read more

When I was writing an article on the Mandelbrot set, I looked for software to generate illustrations. Needless to say that there is lots of stuff available for a colorful subject like that. But, lo and behold, I discovered that the venerable *Fractint* still exists, and is actually still maintained! The program…

If you want to launch a rocket into space, as I’m sure practically all of you are at least contemplating, where should you do that? The main thing is of course to avoid populated areas, to limit the damage if the thing blows up. The launch pad itself should be located away from people, and there should be a large uninhabited region to the *east* of the launch site… read more

If you think about a set with an infinite number of elements, you might conclude that there is not much to say about the number of elements anymore. Infinite is infinite, right? Well, it turns out that not every infinity has the same “value”, and that there’s actually quite a lot to say about it. Take the natural numbers… read more

Euler’s identity, \(e^{i\pi}+1=0\), must be the most beautiful formula in the whole of mathematics. The expression establishes an amazing relation between five important numbers… read more

I’ve actually found a way to combine quality time with my seven year old daughter, pinhole photography, and QR codes. Together, we created a QR code from those Hama beads that you iron together. Taking the pinhole photo was easy. read more

The glorious Burj Khalifa (Dubai, United Arab Emirates), in the light of the setting sun. The thinness of the photo is meant to emphasize the slenderness of the building. Maybe it doesn't even fit on your screen… For me, the elegance of the thing was striking. You would expect a building like that to appear really massive, but the architects seem to have completely avoided that. In fact, the Burj Khalifa is so slender that some of the cheap replicas at the airport even had the top spike replaced by a little roof… read more