Key points are not available for this paper at this time.
This Letter presents quantum mechanical inequalities which distinguish, for systems of n spin- 12 particles (n>2), between fully entangled states and states in which at most n-1 particles are entangled. These inequalities are stronger than those obtained by Gisin and Bechmann-Pasquinucci Phys. Lett. A 246, 1 (1998) and by Seevinck and Svetlichny quant-ph/0201046.
Jos Uffink (2002) studied this question.