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Graph with black & white nodes

Graph with black & white nodes

Posers and Puzzles

D

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25 Aug 06
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01 Sep 06
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At time t=0 each node of a graph is initially colored white or black. At times t=1,2,3,... all the nodes are simultaneously given a color according to the following rule: if node X has more white neighbors than black ones, then node X becomes white; if node X has more black neighbors than white ones, then node X becomes black; otherwise node X doesn't change color.
Prove: after a final number of steps the graph reaches a stable state or a period of length 2.
Stable state example:
W---W
Period 2 example:
W---B
(W=white, B=black)

c
Copyright ©2001-2006

Eastbourne

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I noded off reading that.

c

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I didnt understand anything either. Maybe it would make more sense to me if it was written in german 😛

s
Fast and Curious

slatington, pa, usa

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Originally posted by crazyblue
I didnt understand anything either. Maybe it would make more sense to me if it was written in german 😛
It sounds like a variation of the game of 'life' invented about 30 years ago, except that one was done on a spreadsheet matrix and had rules about reproduction, death and such. Intricate patterns that move and others that flip flop in place and others that die out completely appear.

c
Copyright ©2001-2006

Eastbourne

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some go on forever

P
Upward Spiral

Halfway

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Originally posted by sonhouse
It sounds like a variation of the game of 'life' invented about 30 years ago, except that one was done on a spreadsheet matrix and had rules about reproduction, death and such. Intricate patterns that move and others that flip flop in place and others that die out completely appear.
The Sugarscape?

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