Subject: Re: three postings From: Kevin Iga Date: Tue, 16 Nov 2004 16:46:42 PST To: dmd1@lehigh.edu (Don Davis) >> Subject: Re: question for list >> From: jds@sas.upenn.edu >> Date: Tue, 16 Nov 2004 09:28:13 -0500 >> >> There's an excelelnt presentationon film which may have >> been transcribed to video >> I think th title is >> Regular Homotopies in the Plane or something liek that >> >> jim >> I'm wondering if you're thinking of "Outside In", that not only explains the rough idea of the proof (in very hand-waving and ooh-look-and-see terms) for curves in the plane, but also shows an animation that turns the 2-sphere in 3-space inside out through immersions. It was produced by the Geometry Center, but is distributed by AK Peters: http://www.geom.uiuc.edu/docs/outreach/oi/ It's about 20 minutes long and aimed at the undergraduate level. Probably a good way to get the intuition before getting into the details of the rigorous proof. Kevin