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  Contents
- Formal operations on symbols
- Analog or Digital representations (egs. space/ time/ imagery or
language/ arithmetic)
- Intentionality = Semantic content
- Isomorphism of representations to the world (eg. carnivore-dog
hierarchy in a dog-net)
- Appropriate input-output relations (dog-net compared with an
isomorphic dinosaur-net)
- + what else?
- Modularity on functional dimensions (eg. natural modules of an
anvil, an auto engine and a chess-playing computer - see pp. 317-320
in Stillings et. al.)