Back to basics. There exists a universal wavefunction that evolves
according to the Schrodinger equation. Observers are internal structures
in this description. Whether or not one believes that the Born rule can
be derived or not, what matters in practice is that you'll end up having
to use it, so you have to assign a measure for observations that is
given by the summation of the squared modulus of the states that
correspond to those observations. The information about personal
identity must then also be extracted from the wavefunction, so one
cannot insert this in an ad hoc way.
Quantum immortality is therefore wrong because the measure of the states
that correspond to extremely old observers is small.
Saibal
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