All posts by Sam Hartburn

About Sam Hartburn

Sam offers proofreading, copy-editing and answer checking for maths textbooks and digital resources at all levels and for popular and recreational maths books and content. Find out more at www.qbfproofreading.co.uk. Follow her on Twitter at @SamHartburn or find her on LinkedIn.

Parametric T-shirts

I’m excited to share my new TeeMill site, selling T-shirts based on graphs of parametric equations.

Harmonograph Rainbow
Changing Waves
Spirally Flower

There are three designs currently available, and all can be bought in loose fit or fitted, and with or without the equations that created the design displayed underneath.

You can also find GeoGebra files, where you can play with the graphs of the equations yourself, here.

Rupert Polyhedra: Cube

Last week, I wrote about Rupert polyhedra, and how a tetrahedron has the Rupert property. The idea dates back to the 1600s, when Prince Rupert of the Rhine won a bet that it was possible to make a hole in a cube that was large enough for an identical cube to pass through, so let’s look at how the Rupert property works for a cube.

Continue reading Rupert Polyhedra: Cube