Welcome

Eindhoven summer 2025

In five days, participants drew an astrolabe, and experimented with a laminated paper astrolabe in Nesin Math Village near Izmir.

another workshop on the image of the crescent moon in a camera Obscura.

In five days, participants drew an astrolabe, and experimented with a laminated paper astrolabe in Nesin Math Village near Izmir.

At the Third International Prof. Dr. Fuat Sezgin History of Science in Islam Symposium, I presented the mathematics of the conic-section compass in Istanbul University.

In a one-and-a-half hour workshop, participants got the opportunity to analyse,design and assemble a muqarnas with 3D printed muqarnas blocks at Fatih Sultan Mehmet Vakif University in Istanbul.

In a three hour workshop, participants drew a selection of lines and circles of an astrolabe at Fatih Sultan Mehmet Vakif University in Istanbul.

Presentation of our paper: Servants of Mathesis: early seventeenth century teaching in geometry and fortification and digital mathematics education at the conference TechNet 2022 in Lisbon.

Presentation of my paper: A visual interpreter for pre-defined muqarnas units at the conference Generative Art 2021.

For the virtual museum Tesseract, I made a gallery and a catalogue for Margi Lake's geometrical art. Museum Tesseract is an initiative of the "Ars et Mathesis" foundation, a platform and meeting place for mathematicians and artists whose work bridges the intersection between art and mathematics. The gallery in Museum Tesseract contains a selection of 24 recent artworks. The online catalogue provides a description of each artwork, the provenance of the pattern, the geometric layout and the creative processes involved.

At Fatih Sultan Mehmet Vakif University, I did my workshop on the shape of the crescent moon in a camera obscura.

At the The Second International Prof. Dr. Fuat Sezgin History of Science in Islam Symposium, I would like to talk about one of Ibn al-Haytham's experiments to visualise the reflection of light in concave and convex mirrors.

In The 1st International Prof. Dr. Fuat Sezgin Symposium on History of Science in Islam Proceedings Book my contribution The Istanbul Museum of the History of Science and Technology in Islam as a Source of Inspiration for Modern High School Education: An Instrument for Finding Reflection Points is included. It shows how old instruments from a museum collection can be used for inspiring education.

The article and the presentation are on my website.

At the Turkish Airlines Science Expo 2019 in Bursa, I gave workshops on sundials, reflection in mirrors and geometric patterns with a team of Turkish students and teachers.

At the Konya Science Festival 2018, I gave workshops on sundials with a team of Turkish students and teachers.

At the Bursa Uludag AstroFest 2018, I gave workshops on sundials with a team of Turkish students

At the Turkish Airlines Science Expo 2018 in Bursa, I gave workshops on sundials and reflection in mirrors with a team of Turkish students and teachers.

At the Bursa Uludag AstroFest 2017, I gave workshops on sundials

At the Turkish Airlines Science Expo 2017, I gave workshops on sundials and astrolabes

At the Bursa Uludag AstroFest 2016, we gave workshops on sundials and astrolabes

I presented a workshop about an instrument to find reflection points in all kind of mirrors. The instrument is attributed to Leonardo da Vinci, but the story goes back to Ibn al-Haytham. In 2018/2019 we continued with our research and did remarkable discoveries, which will be presented at The First International Prof. Dr. Fuat Sezgin History of Science in Islam Symposium.

I presented a workshop about the perfect compass made by Abu Sahl al-Quhi. With this instrument, one can draw circles of course, but also parabola, hyperbola, ellipses and even a straight line!

I presented a workshop about a medieval portable sundial attributed to Ibn al-Raqqâm.

Welcome to the "Mathematical Exercises" of Frans van Schooten Junior. He lived in the 17^th century and taught his pupils algebra, geometry, fortification and more. His book is over 500 pages and most of them are translated into modern Dutch. Student exercises and animations are available too.

This chapters deals with fifty exercises about areas of polygonal pieces of land.

This chapter deals about geometrical calculalation of distances between points which are not accessible.

Frans van schooten wrote his thesis on mechanical devices for conic sections.

Frans van Schooten was looking for complex triangles. These are triangles of which the lengths of the sides are whole numbers. You can think of rectangular triangles, but also of triangles whose dividing line divides the opposite sides into two whole numbers.

François Viète included in his book Opera Mathematica a section called Zeteticorum containing a large number of tasks in the form, given this and that, calculate the unknowns, e.g. given sum and difference of two unknown numbers A and B or given product and quotient of two unknown numbers A and B, calculate those unknown numbers