Identity criteria

• Based on the sameness of a certain propertyf(x,t) _ f(y,tí) _ ((c(x,z,t) _ c(y,z,tí))_ x = y)

• t = tí : synchronic; t ƒ tí : diachronic

• Generalization:

f(x,t) _ f(y,tí) _ (G(x,y, t ,tí)_ x = y)

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