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The question as to whether some objects are possible worlds that have an initial segment in common, i.e. so that their fusion is a temporal tree whose branches are possible worlds, arises both for those who hold that our universe has the structure of a temporal tree and for those who hold that what there is includes concrete universes of every possible variety. The notion of “possible world” employed...
For various reasons several authors have enriched classical first order syntax by adding a predicate abstraction operator. “Conservatives” have done so without disturbing the syntax of the formal quantifiers but “revisionists” have argued that predicate abstraction motivates the universal quantifier’s re-classification from an expression that combines with a variable to yield a sentence from a sentence,...
Man has been taking fish from the North Sea for 1,000s of years and intensive, mechanised fishing has been occurring for over 100 years — longer than the period of marine biological studies. It is therefore impossible to use the standard approaches to the assessment of the ecological effects of fisheries — there are no baseline/pre-impact data. In this study a variety of approaches are used to attempt...
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