Dear Bruno,

I have used the Easter holidays to read again through your SANE 2004 
paper, and I have a question regarding step 7.

(I am fine with step 1-6, step 8 seems OK but I will withhold judgment 
until I understand step 7 ;-)

The things I am unclear about are:
1) maximally complete computational histories going through a state -> 
what are these?

2) Why do they correspond to _consistent_ extensions, and how do you 
define these consistent extensions (in a normal logical way -> no 
contradiction; or differently?)-

3) And how do you treat the Boltmann brain issue which crops up in 
modern cosmology but also in a UD generating _all_ computational histories?


Günther Greindl
Department of Philosophy of Science
University of Vienna


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