Footnotes

^{<Note 1>} http://www.santafe.edu/projects/swarm

^{<Note 2>} http://www.santafe.edu

^{<Note 3>} This is a factor of 10 smaller than the value originally suggested by Varela et al. This reflects the fact that the maximum rate of the production reaction is approximately this much slower in SCL than in the original model, so that 10 timesteps in SCL can be considered roughly comparable to one timestep in the original.

^{<Note 4>} Of course, this would make spontaneous formation of an initial membrane much less probable; but that issue was deferred.

^{<Note 5>} Presumably, the K particle should not be assigned an effect of rupturing these bonds again, because they cannot be distinguished from the bonds making up the membrane; on the other hand, this does seem to have been a mechanism actually used by Zeleny in some experiments [9, Figure 6,].

^{<Note 6>} This interaction has previously been outlined in the SCL documentation [5]. However, there is an error, or ambiguity, in that description, in that it suggests that bond inhibition applies to both free and singly bonded L particles. In fact, it applies only to free L particles. Applying it to singly bonded L particles would actually prevent membrane repair from taking place.

mcmullin@eeng.dcu.ie