geometry – Stijn Oomes PhD

Visual geometry of a sphere

When you look at the photo above, what sizes do you think those 5 spheres have? If I tell you that the sheet of paper on the right is an A4. And the photo is taken in my office with the camera lying flat on the edge of my desk. Do your estimates change?

Diagonals of an ellipse

I have been watching Norman Wildberger’s videos on all things mathematics for about 10 years. To say that I have learned a lot is the understatement of the decade. His most recent video is a recorded talk from July this year titled “How Chromogeometry transcends Klein’s Erlangen Program for Planar Geometries”. It is fascinating throughoutContinue reading “Diagonals of an ellipse”

Pen and paper

At the start of my vacation I closed my laptop and went back to pen and paper. To get at the heart of things, nothing beats an empty sheet of paper and a clear schedule. I spent many weeks drawing objects and scenes, and deriving geometrical formulas with pen and paper. Don’t get me wrong,Continue reading “Pen and paper”

Watching geometry on YouTube

I am not a mathematician. During my training as a physicist I developed some competence in fields like geometry, algebra, and calculus, but I do not have the ability to create mathematics. I even find it really hard to read the mathematical literature. So I am probably missing out on exciting methods that may beContinue reading “Watching geometry on YouTube”