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  2. Closed manifold - Wikipedia

    en.wikipedia.org/wiki/Closed_manifold

    Every closed manifold is a Euclidean neighborhood retract and thus has finitely generated homology groups. [2] If is a closed connected n-manifold, the n-th homology group is or 0 depending on whether is orientable or not. [3] Moreover, the torsion subgroup of the (n-1)-th homology group is 0 or depending on whether is orientable or not.

  3. Harley Flanders - Wikipedia

    en.wikipedia.org/wiki/Harley_Flanders

    Theodore Frankel. Harley M. Flanders (September 13, 1925 – July 26, 2013) was an American mathematician, known for several textbooks and contributions to his fields: algebra and algebraic number theory, linear algebra, electrical networks, scientific computing. [1]

  4. Manifold - Wikipedia

    en.wikipedia.org/wiki/Manifold

    A manifold with boundary is a manifold with an edge. For example, a sheet of paper is a 2-manifold with a 1-dimensional boundary. The boundary of an -manifold with boundary is an ()-manifold. A disk (circle plus interior) is a 2-manifold with boundary. Its boundary is a circle, a 1-manifold.

  5. Parallelizable manifold - Wikipedia

    en.wikipedia.org/wiki/Parallelizable_manifold

    Parallelizable manifold. In mathematics, a differentiable manifold of dimension n is called parallelizable[1] if there exist smooth vector fields on the manifold, such that at every point of the tangent vectors provide a basis of the tangent space at . Equivalently, the tangent bundle is a trivial bundle, [2] so that the associated principal ...

  6. Classification of manifolds - Wikipedia

    en.wikipedia.org/wiki/Classification_of_manifolds

    Overview. Low-dimensional manifolds are classified by geometric structure; high-dimensional manifolds are classified algebraically, by surgery theory. "Low dimensions" means dimensions up to 4; "high dimensions" means 5 or more dimensions. The case of dimension 4 is somehow a boundary case, as it manifests "low dimensional" behaviour smoothly ...

  7. Exact trigonometric values - Wikipedia

    en.wikipedia.org/wiki/Exact_trigonometric_values

    The trigonometric functions of angles that are multiples of 15°, 18°, or 22.5° have simple algebraic values. These values are listed in the following table for angles from 0° to 45°. [1] In the table below, the label "Undefined" represents a ratio If the codomain of the trigonometric functions is taken to be the real numbers these entries ...