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Full Idea
Groups may coincide in membership without being identical - extensionality goes.
Gist of Idea
The same members may form two groups
Source
Peter Simons (Parts [1987], 4.9)
Book Ref
Simons,Peter: 'Parts: a Study in Ontology' [OUP 1987], p.168
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?)
12846 | A 'group' is a collection with a condition which constitutes their being united [Simons] |
12848 | The same members may form two groups [Simons] |
12861 | 'The wolves' are the matter of 'the pack'; the latter is a group, with different identity conditions [Simons] |