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A principle extending identity beyond strict equivalence to allow for degrees of sameness or [similarity]. Instead of “A = B or A ≠ B,” spectral identity recognizes that two things can be [identical] in some respects and different in others, and the identity relation can be graded (e.g., in [fuzzy logic], “very similar,” “somewhat identical”). This law is crucial in dealing with vague predicates, gradual change, and family resemblance concepts.
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