A characterization of the definitencss of a Heraritian matrix 1 D. J.FaalfsaadC.H.Raadan, The stability of pure weights under conditioning 5 Aadrew Wkth, Order and norm convergence in Banach lattices . 13 L. Mtesky, Partitioned transversals 14 Robert SOey, Hecke invariants of knot group* 17 W. P. Noviagtr, A local mean-value theorem for analytic function* with smooth boundary valuet ' 27 N. C Haa, Quaat-homology and universal coefficients 30 Craig M. Carte, Semigroups of non-negative integral

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... trices 59 R. N. HBb, A note on uniqueness for anisotropk fluids 43 R. B. Haaaes a d J. D. Ward, An approximative property of spaces of continuous functions 48 R. H. Kelly, On commutative non-self-adjoint operator algebras 54 R, W. K. Oioai, A characterization of determinants over topologkal fields 60 John Bibby, Ariomatisations of the average and a further generalisation of monotonic sequences 63 Chb^HoBg CUag asd Chariot K. O d , Delange's characterization of the sine function 66 E. M. Wright, Asymmetric and symmetric graphs . 69 Efflca TbomM, A generalization of Clifford algebras 74 Cynthia D. Geoffrey and BL E. SeMbick, Chain conditions on posets 79 Robert P. FthMOum tad Robert B. Kebnan, The convergence of least squares approximations for dual orthogonal series 82 Bertram Yood, Semi-algebras in QT) 85 A. D. Saada, On a conjecture of O. Hajos 88 Gk. Moeaan, On the numerical radius of an element of a nonned algebra 90