By J Frauendiener; H Friedrich

ISBN-10: 3540442804

ISBN-13: 9783540442806

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T/J /\ cp) - (from Ax 3 and Ax 4, respectively, in Definition 9, page 17). ,(t/J /\ cp) - I- "''Y-, which is h I t/J /\ cp -+ 'Y}. There are in fact only minor differences between the definition above and Definition 2. The extra bits come from the fact that Belnap's translation is more complicated, since we need the negated "holds" to ensure that the other half of the lattice L4 is also taken into account. The positive holds, checks the 27 values for Both and T, where the negative one checks None and T.

29 In Belnap's logic,

From the point of view of classical logic, what we are doing is a relative revision. This concept can be defined as follows. , Cn(T U L\) being acceptable) 7 • We can talk about revision relative to T of L\ by 1/J (denoted by L\ *T 1/J) yielding a new acceptable theory L\' = L\ *T 1/J. The case where T arises in connection with a translation from another logic is only one instance of this general relative revision. We need to distinguish two cases in our studies of relative revision (a) The notion of acceptability can be easily handled in classical logic.

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The conformal structure of space-time : geometry, analysis, numerics by J Frauendiener; H Friedrich

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