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  2. Bivector - Wikipedia

    en.wikipedia.org/wiki/Bivector

    A description of the projective geometry can be constructed in the geometric algebra using basic operations. For example, given two distinct points in RP n−1 represented by vectors a and b the line containing them is given by a ∧ b (or b ∧ a). Two lines intersect in a point if A ∧ B = 0 for their bivectors A and B. This point is given ...

  3. Complex number - Wikipedia

    en.wikipedia.org/wiki/Complex_number

    5.1 Geometry. 5.1.1 Shapes. 5.1.2 ... A complex number is an expression of the form a + bi, ... the action of the matrix on vectors and the multiplication by the ...

  4. Bivector (complex) - Wikipedia

    en.wikipedia.org/wiki/Bivector_(complex)

    Given a bivector r = r 1 + hr 2, the ellipse for which r 1 and r 2 are a pair of conjugate semi-diameters is called the directional ellipse of the bivector r. [4]: 436 In the standard linear representation of biquaternions as 2 × 2 complex matrices acting on the complex plane with basis {1, h},

  5. Bilinear form - Wikipedia

    en.wikipedia.org/wiki/Bilinear_form

    The left radical and right radical of the form B are the kernels of B 1 and B 2 respectively; [2] they are the vectors orthogonal to the whole space on the left and on the right. [3] If V is finite-dimensional then the rank of B 1 is equal to the rank of B 2. If this number is equal to dim(V) then B 1 and B 2 are linear isomorphisms from V to V ...

  6. Biorthogonal system - Wikipedia

    en.wikipedia.org/wiki/Biorthogonal_system

    In mathematics, a biorthogonal system is a pair of indexed families of vectors ~ ~ such that ~, ~ =,, where and form a pair of topological vector spaces that are in duality, , is a bilinear mapping and , is the Kronecker delta.

  7. Comparison of vector algebra and geometric algebra - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_vector...

    The fundamental difference is that GA provides a new product of vectors called the "geometric product". Elements of GA are graded multivectors: scalars are grade 0, usual vectors are grade 1, bivectors are grade 2 and the highest grade (3 in the 3D case) is traditionally called the pseudoscalar and designated .

  8. Frenet–Serret formulas - Wikipedia

    en.wikipedia.org/wiki/Frenet–Serret_formulas

    A space curve; the vectors T, N, B; and the osculating plane spanned by T and N. In differential geometry, the Frenet–Serret formulas describe the kinematic properties of a particle moving along a differentiable curve in three-dimensional Euclidean space, or the geometric properties of the curve itself irrespective of any motion.

  9. Universal geometric algebra - Wikipedia

    en.wikipedia.org/wiki/Universal_geometric_algebra

    Some r-vectors are scalars (r = 0), vectors (r = 1) and bivectors (r = 2). One may generate a finite-dimensional GA by choosing a unit pseudoscalar (I). The set of all vectors that satisfy = is a vector space. The geometric product of the vectors in this vector space then defines the GA, of which I is a member.