Re: [math-fun] Reflections on Orientation

On 1/25/08, Gareth McCaughan <gareth.mccaughan@pobox.com> wrote:

You stipulated that the letters are different colours on the two sides. Therefore the sheet-plus-inscription is *not* a two-dimensional object in any relevant sense. (You might get away with "2+epsilon- -dimensional", but that's not enough for your argument.)

Replace "colour green" by vector normal to plane. Replace "sticky plastic letters" by three points in general position on plane. Now wriggle out of that! WFL