نتایج جستجو برای: descent categories
تعداد نتایج: 131060 فیلتر نتایج به سال:
Let $mathcal {A}$ be an abelian category with enough projective objects and $mathcal {X}$ be a full subcategory of $mathcal {A}$. We define Gorenstein projective objects with respect to $mathcal {X}$ and $mathcal{Y}_{mathcal{X}}$, respectively, where $mathcal{Y}_{mathcal{X}}$=${ Yin Ch(mathcal {A})| Y$ is acyclic and $Z_{n}Yinmathcal{X}}$. We point out that under certain hypotheses, these two G...
We firstly prove the completeness of the category of crossed modules in a modified category of interest. Afterwards, we define pullback crossed modules and pullback cat objects that are both obtained by pullback diagrams with extra structures on certain arrows. These constructions unify many corresponding results for the cases of groups, commutative algebras and can also be adapted to ...
This paper presents a system for shot-level camera motion analysis via the estimation of global motion from image sequences. An affine model is used to parameterize the global motion resulting from motion of a camera (e.g. pan, zoom, tilt, rotation). A singular value decomposition (SVD) based gradient descent is executed to minimize the prediction error. To assure the convergence of the gradien...
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