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Dual (abbreviated DU) is a grammatical number that some languages use in addition to singular and plural. When a noun or pronoun appears in dual form, it is interpreted as referring to precisely two of the entities (objects or persons) identified by the noun or pronoun acting as a single unit or in unison. Verbs can also have dual agreement ...
Duality (mathematics) In mathematics, a duality translates concepts, theorems or mathematical structures into other concepts, theorems or structures in a one-to-one fashion, often (but not always) by means of an involution operation: if the dual of A is B, then the dual of B is A. In other cases the dual of the dual – the double dual or ...
Upper and lower bounds. In mathematics, particularly in order theory, an upper bound or majorant[1] of a subset S of some preordered set (K, ≤) is an element of K that is greater than or equal to every element of S. [2][3] Dually, a lower bound or minorant of S is defined to be an element of K that is less than or equal to every element of S.
Dually, a partially ordered set in which all pairs have a meet is a meet-semilattice. A partially ordered set that is both a join-semilattice and a meet-semilattice is a lattice. A lattice in which every subset, not just every pair, possesses a meet and a join is a complete lattice.
A "dually" is a North American colloquial term for a pickup with four rear wheels instead of two, able to carry more weight over the rear axle. Vehicles similar to the pickup include the coupé utility, a car-based pickup, and the larger sport utility truck (SUT), based on a sport utility vehicle (SUV).
Drug-drug interaction. This is when a medication reacts with one or more other drugs. For example, taking a cough medicine (antitussive) and a drug to help you sleep (sedative) could cause the two ...
Semilattice. In mathematics, a join-semilattice (or upper semilattice) is a partially ordered set that has a join (a least upper bound) for any nonempty finite subset. Dually, a meet-semilattice (or lower semilattice) is a partially ordered set which has a meet (or greatest lower bound) for any nonempty finite subset.
Introduction. The term differential is used nonrigorously in calculus to refer to an infinitesimal ("infinitely small") change in some varying quantity. For example, if x is a variable, then a change in the value of x is often denoted Δ x (pronounced delta x). The differential dx represents an infinitely small change in the variable x.