the takeback of products that have reached the end of their useful life

The study of algebraic number fields, and, more generally, of algebraic extensions of the field of rational numbers, is the central topic of algebraic number theory.

The Modernist theoretical framework that argues the appearance of glitch forms in “glitch art” is an inherently critical activity originates with claims that technical failures of all types reveal the material foundations alluding to capitalist productive processes.

Consider an arbitrary finite set S. The family 𝒫 of all strict partial orders (asymmetric, transitive, cf. 1.8.3, p. 14) on S enjoys a remarkable property: any partial order P can be linked to any other partial order P’ by a sequence of steps each of which consists of changing the order either by adding one ordered pair of elements of S (imposing an ordering between two previously-incomparable elements) or by removing one ordered pair (causing two previously related elements to become incomparable), without ever leaving the family 𝒫.