qualitative identity


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qualitative identity

n
(Logic) logic the relation that holds between two relata that have properties in common. This term is used to distinguish many uses of the words identical or same in ordinary language from strict identity or numerical identity
References in periodicals archive ?
But the persistence concerns a numerical identity (a same), and the invariability concerns the qualitative identity (something that does not change over time), which would mean that the immediate and analytical inference to be made from the numerical identity to the qualitative identity, will fail on the logical plan.
Sider uses this example to introduce the problem of personal identity and to explain the distinction between quantitative and qualitative identity.
Now the English word "same" is ambiguous between numerical identity (as in "This is the same ball that Sandy Koufax threw the last strike with") and qualitative identity (as in "Your car and mine are just the same").

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