On Wed, Jul 31, 2019 at 10:08 AM George Hart <george@georgehart.com> wrote:
Mike,
That's odd. (It works for me from the SF web server.) Are you in a distant country at the moment where videos might be blocked?
No, I'm in Utah near Rich.
There is also a YouTube copy here:
Thanks!
And a Scientific American copy here:
https://www.scientificamerican.com/article/mathematical-impressions-the-surp...
George http://georgehart.com
On 7/31/2019 11:42 AM, Mike Stay wrote:
I get "Sorry. Because of its privacy settings, this video cannot be played here."
On Wed, Jul 31, 2019 at 9:29 AM George Hart <george@georgehart.com> wrote:
Hi James,
There is an example of that about two minutes into this video, as a warmup to what happens when you slice the Menger Sponge:
https://www.simonsfoundation.org/2012/12/10/mathematical-impressions-the-sur...
George http://georgehart.com
On 7/31/2019 8:10 AM, James Propp wrote:
I just realized that, to illustrate Warren Smith's way of proving the Wall of Fire theorem at my August 7 talk, it'd be cool to have a video or GIF showing how the intersection between the 2-skeleton of a moving cubical network and a fixed plane evolves in time. For instance, say the plane is {(x,y,z): x+y+z=0} and the cubical network is the standard one in Z^3 moving at constant speed in the (1,1,1) direction, which one can write as {(x,y,z); x≡t (mod 1) or y≡t (mod 1) or z≡t (mod 1)}. We see a dynamic dissection of the plane in which equilateral triangles grow and turn into hexagons and then turn into shrinking triangles pointing the other way.
Can anyone dash off such a video? If I use it in my talk I will of course give credit.
Thanks,
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