insolite (insolite) wrote,
insolite
insolite

Similarity

We cannot easily imagine a more familiar or fundamental notion than this, or a notion more ubiquitous in its applications. On this score it is like the notions of logic: like identity, negation, alternation, and the rest. And yet, strangely, there is something logically repugnant about it. For we are baffled when we try to relate the general notion of similarity significantly to logical terms. One's first hasty suggestion might be to say that things are similar when they have all or most or many properties in common. Or, trying to be less vague, one might try defining comparative similarity—“a is more similar to b than to c”—as meaning that a shares more properties with b than with c. But any such course only reduces our problem to the unpromising task of settling what to count as a property.

― W. V. Quine “Ontological Relativity & Other Essays”
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