Graded (mathematics)

Differential operators | Linear algebra

In mathematics, the term “graded” has a number of meanings, mostly related: In abstract algebra, it refers to a family of concepts: * An algebraic structure is said to be -graded for an index set if it has a gradation or grading, i.e. a decomposition into a direct sum of structures; the elements of are said to be "homogeneous of degree i ". * The index set is most commonly or , and may be required to have extra structure depending on the type of . * Grading by (i.e. ) is also important; see e.g. signed set (the -graded sets). * The trivial (- or -) gradation has for and a suitable trivial structure . * An algebraic structure is said to be if the index set is a direct product of sets; the pairs may be called "bidegrees" (e.g. see Spectral sequence). * A -graded vector space or graded linear space is thus a vector space with a decomposition into a direct sum of spaces. * A graded linear map is a map between graded vector spaces respecting their gradations. * A graded ring is a ring that is a direct sum of additive abelian groups such that , with taken from some monoid, usually or , or semigroup (for a ring without identity). * The associated graded ring of a commutative ring with respect to a proper ideal is . * A graded module is left module over a graded ring that is a direct sum of modules satisfying . * The associated graded module of an -module with respect to a proper ideal is . * A differential graded module, differential graded -module or DG-module is a graded module with a differential making a chain complex, i.e. . * A graded algebra is an algebra over a ring that is graded as a ring; if is graded we also require . * The graded Leibniz rule for a map on a graded algebra specifies that . * A differential graded algebra, DG-algebra or DGAlgebra is a graded algebra that is a differential graded module whose differential obeys the graded Leibniz rule. * A homogeneous derivation on a graded algebra A is a homogeneous linear map of grade d = |D| on A such that acting on homogeneous elements of A. * A graded derivation is a sum of homogeneous derivations with the same . * A DGA is an augmented DG-algebra, or , (see Differential graded algebra). * A superalgebra is a -graded algebra. * A graded-commutative superalgebra satisfies the "supercommutative" law for homogeneous x,y, where represents the “parity” of , i.e. 0 or 1 depending on the component in which it lies. * CDGA may refer to the category of augmented differential graded commutative algebras. * A graded Lie algebra is a Lie algebra that is graded as a vector space by a gradation compatible with its Lie bracket. * A graded Lie superalgebra is a graded Lie algebra with the requirement for anticommutativity of its Lie bracket relaxed. * A supergraded Lie superalgebra is a graded Lie superalgebra with an additional super -gradation. * A differential graded Lie algebra is a graded vector space over a field of characteristic zero together with a bilinear map and a differential satisfying for any homogeneous elements x, y in L, the “graded Jacobi identity” and the graded Leibniz rule. * The Graded Brauer group is a synonym for the Brauer–Wall group classifying finite-dimensional graded central division algebras over the field F. * An -graded category for a category is a category together with a functor . * A differential graded category or DG category is a category whose morphism sets form differential graded -modules. * Graded manifold – extension of the manifold concept based on ideas coming from supersymmetry and supercommutative algebra, including sections on * Graded function * Graded vector fields * Graded exterior forms * Graded differential geometry * Graded differential calculus In other areas of mathematics: * Functionally graded elements are used in finite element analysis. * A graded poset is a poset with a rank function compatible with the ordering (i.e. ) such that covers .This article includes a list of related items that share the same name (or similar names). If an internal link incorrectly led you here, you may wish to change the link to point directly to the intended article. (Wikipedia).

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