Pre-supposing?

Pre-supposing
• The idea: the speaker x pp φ by using a sentence S iff updating
locally or globally with φ (the pp) ‘necessarily’ precedes the use of
S.
‘Necessarily’ = whichever agent and whichever sequence of belief
states we consider.
• Requiring that the precedence relation hold over all possible sequences
for all possible agents excludes accidental precedence (as
in a sequence of disconnected assertive updates).
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