Inconsistent quartet, personal identity:
\begin{enumerate}
\item Beatrice is not identical to Caitlyn.
\item Ahmed is psychologically continuous with Beatrice.
\item Ahmed is psychologically continuous with Caitlyn.
\item The Psychological Continuity View of personal identity is true.
\end{enumerate}
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Work out what this quartet is inconsistent
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But is it possible?
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Following, roughly, \citet{johnston:1989_fission}.
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‘What this must mean, then, is that the identity relation just is not what
matters (or is not what matters very much) in survival;
instead, what
matters has to consist in psychological continuity and/or connectedness
(what Parfit calls “Relation R”).
As long as that relation holds between
me-now and some other person-stage---regardless of whether or not it holds
one-one---what happens to me is just as good as ordinary survival.
Call
this the Identity Doesn't Matter (IDM) view.’
\citep{shoemaker:2019_personal}
\citep{shoemaker:2019_personal}