1 For example, A. R. Lacey, "Quantifier Words", in A. R. Lacey.vi Dictionary of Philosophy (Charles Scribner's Sons, N. Y.: 1976); Alex Orenstein, Existence and the Particular Quantifier (Temple U. Press, Philadelphia: 1978), pp. 105-07; Baruch Brody, "Glossary of Logical Terms", Encyclopedia of Philosophy, Vol. 5 (Macmillan, N. Y.: 1967), p. 64; Antony Flew, "Existential Import", in Antony Fle...

BACKGROUND A majority of people in Western Europe and the USA die in hospitals. Spiritual and existential care is seen to be an integral component of holistic, compassionate and comprehensive palliative care. Yet, several studies show that many nurses are anxious and uncertain about engaging in spiritual and existential care for the dying. The aim of this study is to describe nurses' experience...

We consider two kinds of reeective relational machines: the usual ones, which use rst order queries, and existential reeective machines, which use only rst order existential queries. We compare these two computation models. We build on already existing results for standard relational machines, obtained by Abiteboul, Papadimitriou and Vianu APV], so we prove only results for existential machines...