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Full Idea
It would be better to drop talk of 'numerical' and 'qualitative' identity altogether, speaking instead simply of identity and resemblance.
Gist of Idea
It is best to drop types of identity, and speak of 'identity' or 'resemblance'
Source
Colin McGinn (Logical Properties [2000], Ch.1 n4)
Book Ref
McGinn,Colin: 'Logical Properties' [OUP 2003], p.2
A Reaction
This is the kind of beautifully simple proposal I pay analytical philosophers to come up with. I will attempt in future to talk either of 'identity' (which is strict), or 'resemblance' (which comes in degrees).