Cut a circular hole of radius 1 in paper. How big a disc will pass through?twitter.com·2 pts·FillMaths·1
New course on Infinity at Notre Dame (with invitation for open participation)jdh.hamkins.org·1 pts·FillMaths·0
New course on Infinity at Notre Dame (with open participation invitation)jdh.hamkins.org·2 pts·FillMaths·0
Self-similar self-similarity, a playful essay on symmetry by Joel David Hamkinsjdh.hamkins.org·2 pts·FillMaths·0