Parfit's reductionist framework, which grounds degrees-of-identity talk, entails that personal identity itself is not what matters—undermining rather than supporting degree-based identity claims.

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Degrees-of-identity(as the central concept being discussed): The idea that you don't have to be 100% identical to your past self to be 'you'—you can be somewhat the same person as you were, to varying degrees, depending on how many memories and personality traits you share.
Parfit: Derek Parfit was a highly influential British philosopher known for revolutionizing how we think about personal identity, morality, and what makes life worth living. He argued that our sense of being a continuous, unified "self" is partly an illusion, and that what really matters is the continuation of our thoughts and experiences, not some invisible thread connecting us through time. His ideas have shaped modern ethics and how philosophers approach questions about identity, responsibility, and how we should treat future generations.
Reductionist framework(as Parfit's philosophical approach): An approach that breaks down a complex concept into simpler parts; in Parfit's case, it means personal identity isn't one big thing but rather a collection of psychological connections that can exist in degrees.
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