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4. Formal Logic / G. Formal Mereology / 4. Groups

[collections of individuals with a unifying concept]

3 ideas
A 'group' is a collection with a condition which constitutes their being united [Simons]
     Full Idea: We call a 'collection' of jewels a 'group' term. Several random musicians are unlikely to be an orchestra. If they come together regularly in a room to play, such conditions are constitutive of an orchestra.
     From: Peter Simons (Parts [1987], 4.4)
     A reaction: Clearly this invites lots of borderline cases. Eleven footballers don't immediately make a team, as followers of the game know well.
The same members may form two groups [Simons]
     Full Idea: Groups may coincide in membership without being identical - extensionality goes.
     From: Peter Simons (Parts [1987], 4.9)
     A reaction: Thus an eleven-person orchestra may also constitute a football team. What if a pile of stones is an impediment to you, and useful to me? Is it then two groups? Suppose they hum while playing football? (Don't you just love philosophy?)
'The wolves' are the matter of 'the pack'; the latter is a group, with different identity conditions [Simons]
     Full Idea: 'The wolves' is a plural term referring to just these animals, whereas 'the pack' of wolves refers to a group, and the group and plurality, while they may coincide in membership, have different identity conditions. The wolves are the matter of the pack.
     From: Peter Simons (Parts [1987], 6.4)
     A reaction: Even a cautious philosopher like Simons is ready to make bold ontological commitment to 'packs', on the basis of something called 'identity conditions'. I think it is just verbal. You can qualify 'the wolves' and 'the pack' to make them identical.