We construct new invariants of quadratic forms over commutative rings, using ideas from Topology. More precisely, we de…ne a hermitian analog of the Bott class with target algebraic K-theory, based on the classi…cation of Cli¤ord modules. These invariants of quadratic forms go beyond the classical invariants de…ned via the Cli¤ord algebra. An appendix by J.-P. Serre, of independent interest, de...

OPSOMMING ’n O pnam e v an b esk ik b are geson d h eid sd ien ste in Sow eto is deur telefon iese en p ersoonlik e onderhoud e gem aak . D em ografïese en sosiaa l-ek on om iese in lig tin g oor d ie gebied, so o s op p erv lak te , k lim aat, b evo lk in g , fa s ilite ite v ir om gew ingsh ig iëne, w erksgeleen th ed e, on d erw y s en op voed in g w ord gegee. D ie a lgem en e g eson d h ei...

Spatial regression methodology has been around for most of the 50 years (1961-2011) that the Southern Regional Science Association has been in existence. Cliff and Ord (1969) devised a parsimonious specification for the structure of spatial dependence among observations that could be used to empirically model spatial interdependence. Later work (Cliff and Ord, 1973, 1981; Ord, 1975) further dev...

The type I iodothyronine deiodinase (ID-I) in liver and kidney converts the prohormone thyroxine (T4) by outer ring deiodination (ORD) to bioactive 3,3',5-triiodothyronine (T3) or by inner ring deiodination (IRD) to inactive 3,3',5-triiodothronine (rT3), while it also catalyzes the IRD of T3 and the ORD of rT3, with the latter as the preferred substrate. Sulfation of the phenolic hydroxyl group...

Applying (enriched) categorical structures we define the notion of ordered sheaf on a quantaloid Q, which we call ‘Q-order’. This requires a theory of semicategories enriched in the quantaloid Q, that admit a suitable Cauchy completion. There is a quantaloid Idl(Q) of Q-orders and ideal relations, and a locally ordered category Ord(Q) of Q-orders and monotone maps; actually, Ord(Q) = Map(Idl(Q)...