We call Donald Trump and Boris Johnston and his cat and the mice that the cat hunts and the fleas on the mice and the coronavirus etc LIVING. But Boris's desk and his TV and the computer program that beats him at chess and and his electronic android servant (soon!) and windmills (cf Don Quixote) and holograms and ghosts we call NOT LIVING. But what is the difference? As a mathematical kind of person I would really like to know ... and rather precisely... it matters for agent based modelling etc

Note -- the difference is surely not about reproduction -- computer programs and machines can easily generate and distribute copies of themselves.

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