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  2. Convex cone - Wikipedia

    en.wikipedia.org/wiki/Convex_cone

    In linear algebra, a cone—sometimes called a linear cone for distinguishing it from other sorts of cones—is a subset of a real vector space that is closed under positive scalar multiplication; that is, is a cone if implies for every positive scalar .

  3. Cone (algebraic geometry) - Wikipedia

    en.wikipedia.org/wiki/Cone_(algebraic_geometry)

    More generally, given a vector bundle (finite-rank locally free sheaf) E on X, if R=Sym(E *) is the symmetric algebra generated by the dual of E, then the cone ⁡ is the total space of E, often written just as E, and the projective cone ⁡ is the projective bundle of E, which is written as ().

  4. Cone - Wikipedia

    en.wikipedia.org/wiki/Cone

    A right circular cone and an oblique circular cone A double cone (not shown infinitely extended) 3D model of a cone. A cone is a three-dimensional geometric shape that tapers smoothly from a flat base (frequently, though not necessarily, circular) to a point called the apex or vertex that is not contained in the base.

  5. Dual cone and polar cone - Wikipedia

    en.wikipedia.org/wiki/Dual_cone_and_polar_cone

    A cone C in a vector space X is said to be self-dual if X can be equipped with an inner product ⋅,⋅ such that the internal dual cone relative to this inner product is equal to C. [3] Those authors who define the dual cone as the internal dual cone in a real Hilbert space usually say that a cone is self-dual if it is equal to its internal dual.

  6. Conic section - Wikipedia

    en.wikipedia.org/wiki/Conic_section

    A conic is the curve obtained as the intersection of a plane, called the cutting plane, with the surface of a double cone (a cone with two nappes).It is usually assumed that the cone is a right circular cone for the purpose of easy description, but this is not required; any double cone with some circular cross-section will suffice.

  7. Koecher–Vinberg theorem - Wikipedia

    en.wikipedia.org/wiki/Koecher–Vinberg_theorem

    In operator algebra, the Koecher–Vinberg theorem is a reconstruction theorem for real Jordan algebras. It was proved independently by Max Koecher in 1957 [ 1 ] and Ernest Vinberg in 1961. [ 2 ] It provides a one-to-one correspondence between formally real Jordan algebras and so-called domains of positivity.

  8. Symmetric cone - Wikipedia

    en.wikipedia.org/wiki/Symmetric_cone

    Then H n (R) is a simple Euclidean Jordan algebra of rank n for n ≥ 3. Let H n (C) be the space of complex self-adjoint n by n matrices with inner product (a,b) = Re Tr ab* and Jordan product a ∘ b = ⁠ 1 / 2 ⁠ (ab + ba). Then H n (C) is a simple Euclidean Jordan algebra of rank n for n ≥ 3.

  9. Power cone - Wikipedia

    en.wikipedia.org/wiki/Power_cone

    In linear algebra, a power cone is a kind of a convex cone that is particularly important in modeling convex optimization problems. [1] [2] It is a generalization of the quadratic cone: the quadratic cone is defined using a quadratic equation (with the power 2), whereas a power cone can be defined using any power, not necessarily 2.

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