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Graded (mathematics) : ウィキペディア英語版
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 X is said to be I-graded for an index set I if it has a gradation or grading, i.e. a decomposition into a direct sum X = \oplus_ X_i of structures; the elements of X_i are said to be “homogeneous of degree ''i''”.** The index set I is most commonly \mathbb or \mathbb, and may be required to have extra structure depending on the type of X.** Grading by \mathbb_2 (i.e. \mathbb/2\mathbb) is also important.** The trivial (\mathbb- or \mathbb-) gradation has X_0 = X, X_i = 0 for i \neq 0 and a suitable trivial structure 0.** An algebraic structure is said to be doubly graded if the index set is a direct product of sets; the pairs may be called “bidegrees” (e.g. see spectral sequence).* A I-graded vector space or graded linear space is thus a vector space with a decomposition into a direct sum V = \oplus_ V_i 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 abelian groups R_i such that R_i R_j \subseteq R_, with i taken from some monoid, usually \mathbb or \mathbb, or semigroup (for a ring without identity).** The associated graded ring of a commutative ring R with respect to a proper ideal I is \operatorname_I R = \oplus_.* A graded module is left module M over a graded ring which is a direct sum \oplus_ M_i of modules satisfying R_i M_j \subseteq M_.** The associated graded module of an R-module M with respect to a proper ideal I is \operatorname_I M = \oplus_ M.** A differential graded moduledifferential graded category -->, differential graded \mathbb-module or DG-module is a graded module M with a differential d\colon M \to M \colon M_i \to M_ making M a chain complex, i.e. d \circ d=0 .* A graded algebra is an algebra A over a ring R that is graded as a ring; if R is graded we also require A_iR_j \subseteq A_ \supseteq R_iA_j.** The graded Leibniz rule for a map d\colon A \to A on a graded algebra A specifies that d(a \cdot b) = (da) \cdot b + (-1)^a \cdot (db) |a| denotes the “parity” of a ? -->.** A differential graded algebra, DG-algebra or DGAlgebra is a graded algebra which 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 D(ab)=D(a)b+\varepsilon^aD(b), \varepsilon = \pm 1 acting on homogeneous elements of ''A''.** A graded derivation Graded derivation redirects to Differential algebra, which says nothing about it --> is a sum of homogeneous derivations with the same \varepsilon.** A DGA is an augmented DG-algebra, or differential graded augmented algebra, (see differential graded algebra).** A superalgebra is a \mathbb_2-graded algebra.*** A graded-commutative superalgebra satisfies the “supercommutative” law yx = (-1)^xy.\, for homogeneous ''x'',''y'', where |a| represents the “parity” of a, 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 which 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 \mathbb_2-gradation.** A Differential graded Lie algebra is a graded vector space over a field of characteristic zero together with a bilinear map (): L_i \otimes L_j \to L_ and a differential d: L_i \to L_ satisfying () = (-1)^(), 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 BW(F) classifying finite-dimensional graded central division algebras over the field ''F''.* An \mathcal-graded category for a category \mathcal is a category \mathcal together with a functor F:\mathcal \rightarrow \mathcal.** A differential graded category or DG category is a category whose morphism sets form differential graded \mathbb-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 calculusIn other areas of mathematics:* Functionally graded elements are used in finite element analysis.* A graded poset is a poset P with a rank function \rho\colon P \to \mathbb compatible with the ordering (i.e. \rho(x) ) such that y covers x \implies \rho(y)=\rho(x)+1 .

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 X is said to be I-graded for an index set I if it has a gradation or grading, i.e. a decomposition into a direct sum X = \oplus_ X_i of structures; the elements of X_i are said to be “homogeneous of degree ''i''”.
*
* The index set I is most commonly \mathbb or \mathbb, and may be required to have extra structure depending on the type of X.
*
* Grading by \mathbb_2 (i.e. \mathbb/2\mathbb) is also important.
*
* The trivial (\mathbb- or \mathbb-) gradation has X_0 = X, X_i = 0 for i \neq 0 and a suitable trivial structure 0.
*
* An algebraic structure is said to be doubly graded if the index set is a direct product of sets; the pairs may be called “bidegrees” (e.g. see spectral sequence).
* A I-graded vector space or graded linear space is thus a vector space with a decomposition into a direct sum V = \oplus_ V_i 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 abelian groups R_i such that R_i R_j \subseteq R_, with i taken from some monoid, usually \mathbb or \mathbb, or semigroup (for a ring without identity).
*
* The associated graded ring of a commutative ring R with respect to a proper ideal I is \operatorname_I R = \oplus_.
* A graded module is left module M over a graded ring which is a direct sum \oplus_ M_i of modules satisfying R_i M_j \subseteq M_.
*
* The associated graded module of an R-module M with respect to a proper ideal I is \operatorname_I M = \oplus_ M.
*
* A differential graded module, differential graded \mathbb-module or DG-module is a graded module M with a differential d\colon M \to M \colon M_i \to M_ making M a chain complex, i.e. d \circ d=0 .
* A graded algebra is an algebra A over a ring R that is graded as a ring; if R is graded we also require A_iR_j \subseteq A_ \supseteq R_iA_j.
*
* The graded Leibniz rule for a map d\colon A \to A on a graded algebra A specifies that d(a \cdot b) = (da) \cdot b + (-1)^a \cdot (db) .
*
* A differential graded algebra, DG-algebra or DGAlgebra is a graded algebra which 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 D(ab)=D(a)b+\varepsilon^aD(b), \varepsilon = \pm 1 acting on homogeneous elements of ''A''.
*
* A graded derivation is a sum of homogeneous derivations with the same \varepsilon.
*
* A DGA is an augmented DG-algebra, or differential graded augmented algebra, (see differential graded algebra).
*
* A superalgebra is a \mathbb_2-graded algebra.
*
*
* A graded-commutative superalgebra satisfies the “supercommutative” law yx = (-1)^xy.\, for homogeneous ''x'',''y'', where |a| represents the “parity” of a, 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 which 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 \mathbb_2-gradation.
*
* A Differential graded Lie algebra is a graded vector space over a field of characteristic zero together with a bilinear map (): L_i \otimes L_j \to L_ and a differential d: L_i \to L_ satisfying () = (-1)^(), 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 BW(F) classifying finite-dimensional graded central division algebras over the field ''F''.
* An \mathcal-graded category for a category \mathcal is a category \mathcal together with a functor F:\mathcal \rightarrow \mathcal.
*
* A differential graded category or DG category is a category whose morphism sets form differential graded \mathbb-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 P with a rank function \rho\colon P \to \mathbb compatible with the ordering (i.e. \rho(x) < \rho(x) \implies x < y) such that y covers x \implies \rho(y)=\rho(x)+1 .


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「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 X is said to be I-graded for an index set I if it has a gradation or grading, i.e. a decomposition into a direct sum X = \oplus_ X_i of structures; the elements of X_i are said to be “homogeneous of degree ''i''”.** The index set I is most commonly \mathbb or \mathbb, and may be required to have extra structure depending on the type of X.** Grading by \mathbb_2 (i.e. \mathbb/2\mathbb) is also important.** The trivial (\mathbb- or \mathbb-) gradation has X_0 = X, X_i = 0 for i \neq 0 and a suitable trivial structure 0.** An algebraic structure is said to be doubly graded if the index set is a direct product of sets; the pairs may be called “bidegrees” (e.g. see spectral sequence).* A I-graded vector space or graded linear space is thus a vector space with a decomposition into a direct sum V = \oplus_ V_i 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 abelian groups R_i such that R_i R_j \subseteq R_, with i taken from some monoid, usually \mathbb or \mathbb, or semigroup (for a ring without identity).** The associated graded ring of a commutative ring R with respect to a proper ideal I is \operatorname_I R = \oplus_.* A graded module is left module M over a graded ring which is a direct sum \oplus_ M_i of modules satisfying R_i M_j \subseteq M_.** The associated graded module of an R-module M with respect to a proper ideal I is \operatorname_I M = \oplus_ M.** A differential graded moduledifferential graded category -->, differential graded \mathbb-module or DG-module is a graded module M with a differential d\colon M \to M \colon M_i \to M_ making M a chain complex, i.e. d \circ d=0 .* A graded algebra is an algebra A over a ring R that is graded as a ring; if R is graded we also require A_iR_j \subseteq A_ \supseteq R_iA_j.** The graded Leibniz rule for a map d\colon A \to A on a graded algebra A specifies that d(a \cdot b) = (da) \cdot b + (-1)^a \cdot (db) |a| denotes the “parity” of a ? -->.** A differential graded algebra, DG-algebra or DGAlgebra is a graded algebra which 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 D(ab)=D(a)b+\varepsilon^aD(b), \varepsilon = \pm 1 acting on homogeneous elements of ''A''.** A graded derivation Graded derivation redirects to Differential algebra, which says nothing about it --> is a sum of homogeneous derivations with the same \varepsilon.** A DGA is an augmented DG-algebra, or differential graded augmented algebra, (see differential graded algebra).** A superalgebra is a \mathbb_2-graded algebra.*** A graded-commutative superalgebra satisfies the “supercommutative” law yx = (-1)^xy.\, for homogeneous ''x'',''y'', where |a| represents the “parity” of a, 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 which 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 \mathbb_2-gradation.** A Differential graded Lie algebra is a graded vector space over a field of characteristic zero together with a bilinear map (): L_i \otimes L_j \to L_ and a differential d: L_i \to L_ satisfying () = (-1)^(), 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 BW(F) classifying finite-dimensional graded central division algebras over the field ''F''.* An \mathcal-graded category for a category \mathcal is a category \mathcal together with a functor F:\mathcal \rightarrow \mathcal.** A differential graded category or DG category is a category whose morphism sets form differential graded \mathbb-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 calculusIn other areas of mathematics:* Functionally graded elements are used in finite element analysis.* A graded poset is a poset P with a rank function \rho\colon P \to \mathbb compatible with the ordering (i.e. \rho(x) ) such that y covers x \implies \rho(y)=\rho(x)+1 .」の詳細全文を読む



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