Parfit's reductionism demonstrates that what matters in survival is psychological continuity, which can obtain in degrees and branches independently of any single organism's persistence.

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Obtain in degrees(describing how psychological continuity can vary): Can exist in different amounts or strengths rather than being all-or-nothing. For example, psychological continuity might be very strong between you today and you tomorrow, but weaker between you today and you 50 years from now.
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.
Reductionism(The second dogma identified in Quine's "Two Dogmas of Empiricism" (1953, 20)): The belief that each meaningful statement is equivalent to some construct upon terms which refer to immediate experience.
branches

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