WebDefinitions. There are at least three competing definitions of the polar of a set, originating in projective geometry and convex analysis. [citation needed] In each case, the definition describes a duality between certain subsets of a pairing of vector spaces , over the real or complex numbers (and are often topological vector spaces (TVSs)).If is a vector space …

WebUse value (German: Gebrauchswert) or value in use is a concept in classical political economy and Marxist economics.It refers to the tangible features of a commodity (a tradeable object) which can satisfy some human requirement, want or need, or which serves a useful purpose.

WebThe English writer and Anglican cleric John Donne is considered now to be the preeminent metaphysical poet of his time. He was born in 1572 to Roman Catholic parents, when practicing that religion was illegal in England. His work is distinguished by its emotional and sonic intensity and its capacity to plumb the paradoxes of faith, human and divine love, …

WebThe High Middle Ages, or High Medieval Period, was the period of European history that lasted from AD 1000 to 1300. The High Middle Ages were preceded by the Early Middle Ages and were followed by the Late Middle Ages, which ended around AD 1500 (by historiographical convention).. Key historical trends of the High Middle Ages include the …