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  2. Stacks Project - Wikipedia

    en.wikipedia.org/wiki/Stacks_Project

    Download as PDF; Printable version; In other projects ... The Stacks Project is an open source collaborative mathematics textbook writing project with the aim to ...

  3. Openclipart - Wikipedia

    en.wikipedia.org/wiki/Openclipart

    Openclipart, also called Open Clip Art Library, is an online media repository of free-content vector clip art.The project hosts over 160,000 free graphics and has billed itself as "the largest community of artists making the best free original clipart for you to use for absolutely any reason".

  4. Direct image functor - Wikipedia

    en.wikipedia.org/wiki/Direct_image_functor

    If dealing with sheaves of sets instead of sheaves of abelian groups, the same definition applies. Similarly, if f: (X, O X) → (Y, O Y) is a morphism of ringed spaces, we obtain a direct image functor f ∗: Sh(X,O X) → Sh(Y,O Y) from the category of sheaves of O X-modules to the category of sheaves of O Y-modules.

  5. Stack (mathematics) - Wikipedia

    en.wikipedia.org/wiki/Stack_(mathematics)

    An algebraic stack or Artin stack is a stack in groupoids X over the fppf site such that the diagonal map of X is representable and there exists a smooth surjection from (the stack associated to) a scheme to X.

  6. Coherent sheaf cohomology - Wikipedia

    en.wikipedia.org/wiki/Coherent_sheaf_cohomology

    Coherent sheaves can be seen as a generalization of vector bundles.There is a notion of a coherent analytic sheaf on a complex analytic space, and an analogous notion of a coherent algebraic sheaf on a scheme.

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  8. Stack - Wikipedia

    en.wikipedia.org/wiki/Stack

    Stack (mathematics), a sheaf that takes values in categories rather than sets; Algebraic stack, a special kind of stack commonly used in algebraic geometry Stacks Project, an open source collaborative mathematics textbook writing project; Stacking (chemistry), or pi stacking, attractive, noncovalent interactions between aromatic rings

  9. File:Blank US map borders.svg - Wikipedia

    en.wikipedia.org/wiki/File:Blank_US_map_borders.svg

    Special pages; Printable version; Page information; Get shortened URL; Download QR code; ... created specifically for use with thick borders, without labels: