If you're up to speed on your crocheting, its still not too late to whip up this perfect gift for the mathematician on your Christmas list.
Even if crocheting isn't on your list of skills, you can at least add this to your collection of unusual PDF files:
Crocheting the Lorenz manifold
Hinke Osinga and Bernd Krauskopf
Abstract: This paper explains how one can crochet the Lorenz manifold, the two-dimensional stable manifold of the origin of the Lorenz system.
"Imagine a leaf floating in a turbulent river and consider how it passes either to the left or to the right around a rock somewhere downstream."Those special leaves that end up clinging to the rock must have followed a very unique path in the water.
"Each stitch in the crochet pattern represents a single point - a leaf - that ends up at the rock."
-- Hinke Osinga
Hinke Osinga, Lorenz Manifold, Bernd Krauskopf
