Wessex the ensuing Norman Conquest of England, and as the Norman kings soon did away with the great earldoms of the late Anglo-Saxon period, 1066 marks the extinction of Wessex as a political unit. From the second edition (1989) of the "Oxford English Dictionary": Wessex 1. The name of a kingdom in south-west England in Anglo-Saxon times, used by Thomas Hardy as the name of the county in which his stories are set (corresponding approximately to Dorset, Somerset, Hampshire, and Wiltshire) and since used as a name for south-west England or this part of it. Wessex is often symbolised by a
S (set theory) sets" or "the class of all ordinals" include sets from all stages of the iterative hierarchy. Hence such collections cannot be formed at any given stage, and thus cannot be sets. This section follows Boolos (1998: 91). The variables "x" and "y" range over sets, while "r", "s", and "t" range over stages. There are three primitive two-place predicates: The axioms below include a defined two-place set-stage predicate, "Bxr", which abbreviates: "Bxr" is read as “set "x" is formed before stage "r".” Identity, denoted by infix ‘=’, does not play the role in S it plays in other set theories,