The strong completeness of the tableau method

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                            [a] => for the predicate calculus as to obtain a direct proof (without using compactness) of the fact that the most user-friendly formal method of deduction, the Beth-Smullyan method of first-order tableaux, is similarly complete, in the sense that if a formula . is a first-order consequence of an arbitrary set �³ of formulas, there is a finite subset �³0 of �³ such that the set �³0 �¾ { �Ê. } generates a closed tableau. Also, an incidental remark will be made concerning the monotony of the method of tableaux, on a problem which has led to a technical mistake in some of the published literature.
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                            [g] => Nº 31-32,  1998,  pags. 297-308
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