12 Dec
2018
12 Dec
'18
3:25 a.m.
On 2018-12-10 15:10, Mike Stay wrote:
I've seen it here on the list multiple times, but can't find it at the moment. https://imgur.com/a/KeO26Sq
I just call it (turned CW 90º) the complex base -2 region. (The digits are 0 and the cube roots of 1.) "Proof": Divide it by -2. (= rotate 180º and halve the scale.) Make four copies, displaced by each of the four digits. Form their union, which will be disjoint except at the boundaries. It's ba-a-ack! —rwg