Russell: >Christof and Juergen are brothers, aren't they?
Yes. I must say I am quite impressed by the field-semantics of propositional logic. Which part exactly? I'm not sure to figure out. I don't know enough "statistical mechanics" to understand some technical points, also. Note that page 17, in the reply to a first objection, Christof uses implicitely the first person concept. He should developped ... Bruno