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  2. Homotopy - Wikipedia

    en.wikipedia.org/wiki/Homotopy

    A homotopy between two embeddings of the torus into : as "the surface of a doughnut" and as "the surface of a coffee mug".This is also an example of an isotopy.. Formally, a homotopy between two continuous functions f and g from a topological space X to a topological space Y is defined to be a continuous function: [,] from the product of the space X with the unit interval [0, 1] to Y such that ...

  3. Homotopy theory - Wikipedia

    en.wikipedia.org/wiki/Homotopy_theory

    In mathematics, homotopy theory is a systematic study of situations in which maps can come with homotopies between them. It originated as a topic in algebraic topology , but nowadays is learned as an independent discipline.

  4. Homotopy category - Wikipedia

    en.wikipedia.org/wiki/Homotopy_category

    The older definition of the homotopy category hTop, called the naive homotopy category [1] for clarity in this article, has the same objects, and a morphism is a homotopy class of continuous maps. That is, two continuous maps f : X → Y are considered the same in the naive homotopy category if one can be continuously deformed to the other.

  5. Homotopy group - Wikipedia

    en.wikipedia.org/wiki/Homotopy_group

    In mathematics, homotopy groups are used in algebraic topology to classify topological spaces. The first and simplest homotopy group is the fundamental group , denoted π 1 ( X ) , {\displaystyle \pi _{1}(X),} which records information about loops in a space .

  6. Spectrum (topology) - Wikipedia

    en.wikipedia.org/wiki/Spectrum_(topology)

    The stable homotopy category, or homotopy category of (CW) spectra is defined to be the category whose objects are spectra and whose morphisms are homotopy classes of maps between spectra. Many other definitions of spectrum, some appearing very different, lead to equivalent stable homotopy categories.

  7. Regular homotopy - Wikipedia

    en.wikipedia.org/wiki/Regular_homotopy

    Any two knots in 3-space are equivalent by regular homotopy, though not by isotopy. This curve has total curvature 6π, and turning number 3.. The Whitney–Graustein theorem classifies the regular homotopy classes of a circle into the plane; two immersions are regularly homotopic if and only if they have the same turning number – equivalently, total curvature; equivalently, if and only if ...

  8. Homeotopy - Wikipedia

    en.wikipedia.org/wiki/Homeotopy

    The homotopy group functors assign to each path-connected topological space the group () of homotopy classes of continuous maps . Another construction on a space X {\displaystyle X} is the group of all self-homeomorphisms X → X {\displaystyle X\to X} , denoted H o m e o ( X ) . {\displaystyle {\rm {Homeo}}(X).}

  9. Mapping cone (topology) - Wikipedia

    en.wikipedia.org/wiki/Mapping_cone_(topology)

    In mathematics, especially homotopy theory, the mapping cone is a construction in topology analogous to a quotient space and denoted . Alternatively, it is also called the homotopy cofiber and also notated . Its dual, a fibration, is called the mapping fiber.

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