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  2. Stack (mathematics) - Wikipedia

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

    In mathematics a stack or 2-sheaf is, roughly speaking, a sheaf that takes values in categories rather than sets. Stacks are used to formalise some of the main constructions of descent theory , and to construct fine moduli stacks when fine moduli spaces do not exist.

  3. The stack (philosophy) - Wikipedia

    en.wikipedia.org/wiki/The_stack_(philosophy)

    "The stack" is a term used in science and technology studies, the philosophy of technology and media studies to describe the multiple interconnected layers that computation depends on at a planetary scale. The term was introduced by Benjamin H. Bratton in a 2014 essay [1] and expanded upon in his 2016 book The Stack: On Software and Sovereignty, [2] and has been adapted, critiqued and expande

  4. Stacks Project - Wikipedia

    en.wikipedia.org/wiki/Stacks_Project

    The Stacks Project is an open source collaborative mathematics textbook writing project with the aim to cover "algebraic stacks and the algebraic geometry needed to define them".

  5. Constructivism (philosophy of mathematics) - Wikipedia

    en.wikipedia.org/wiki/Constructivism_(philosophy...

    In classical real analysis, one way to define a real number is as an equivalence class of Cauchy sequences of rational numbers.. In constructive mathematics, one way to construct a real number is as a function ƒ that takes a positive integer and outputs a rational ƒ(n), together with a function g that takes a positive integer n and outputs a positive integer g(n) such that

  6. Foundations of mathematics - Wikipedia

    en.wikipedia.org/wiki/Foundations_of_mathematics

    During Middle Ages, Euclid's Elements stood as a perfectly solid foundation for mathematics, and philosophy of mathematics concentrated on the ontological status of mathematical concepts; the question was whether they exist independently of perception or within the mind only (conceptualism); or even whether they are simply names of collection ...

  7. Mathematics - Wikipedia

    en.wikipedia.org/wiki/Mathematics

    The apparent plural form in English goes back to the Latin neuter plural mathematica , based on the Greek plural ta mathēmatiká (τὰ μαθηματικά) and means roughly "all things mathematical", although it is plausible that English borrowed only the adjective mathematic(al) and formed the noun mathematics anew, after the pattern of ...

  8. Pursuing Stacks - Wikipedia

    en.wikipedia.org/wiki/Pursuing_Stacks

    As a matter of fact, the description is formally analogous, and nearly identical, to the description of the homology groups of a chain complex – and it would seem therefore that that stacks (more specifically, Gr-stacks) are in a sense the closest possible non-commutative generalization of chain complexes, the homology groups of the chain complex becoming the homotopy groups of the “non ...

  9. Aristotelian realist philosophy of mathematics - Wikipedia

    en.wikipedia.org/wiki/Aristotelian_realist...

    Aristotelian views of (cardinal or counting) numbers begin with Aristotle's observation that the number of a heap or collection is relative to the unit or measure chosen: "'number' means a measured plurality and a plurality of measures ... the measure must always be some identical thing predicable of all the things it measures, e.g. if the things are horses, the measure is 'horse'."

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