Teorias de Mudança de Crenças (Dinâmica Doxástica) - IFCS

Can we reduce the dynamic case (D) to the static one (S)?
1. (K, K ′ ) is D-justified iff K ′ is S-justified.
Justificação epistêmica
But the origin state K does not enter the right-hand-side. Thus follow some rather
implausible claims:
• (→) The existence of an origin K such that the transition from K to K ′ would be
D-justified, suffices for K ′ to be S-justified.
· Let K = K. The trivial transition (K, K) is presumably always D-justified. But
then every belief set K would be S-justified. – Not a good idea.
• (←) All transitions (K, K ′ ) would be D-justified, given only that K ′ is S-justified.
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· In effect this denies that there is any interesting notion of justifying belief changes.
All belief changes are equally good as long as they are changes to S-justified states.
– Radical and implausible as long as more discriminatory theories of belief change
remain possible.