21 Feb
2007
21 Feb
'07
8:01 a.m.
On 2/21/07, R. William Gosper <rwg@osots.com> wrote:
Cheap and smooth: r=(5+cos(t))^2+(3+cos(2*t))^2 .
Looks more like a squash or pear to me --- must be some funny-shaped birds in your part of the world, Bill!
Suppose we made a piecewise circular-cylindrical funhouse mirror. Could it put corners on its (virtual) image of a smooth object? --rwg
The tangent plane would have to change discontinuously for this to happen. WFL