Invariant Algebras And Geometric Reasoning by Hongbo Li

By Hongbo Li

The call for for extra trustworthy geometric computing in robotics, computing device imaginative and prescient and photographs has revitalized many venerable algebraic topics in arithmetic between them, Grassmann Cayley algebra and Geometric Algebra. these days, they're used as strong languages for projective, Euclidean and different classical geometries.

This publication includes the writer and his collaborators' most up-to-date, unique improvement of Grassmann Cayley algebra and Geometric Algebra and their functions in automatic reasoning of classical geometries. It comprises of the 3 complex invariant algebras Cayley bracket algebra, conformal geometric algebra, and null bracket algebra for hugely effective geometric computing. They shape the speculation of complicated invariants, and trap the intrinsic great thing about geometric languages and geometric computing. except their functions in discrete and computational geometry, the recent languages are at the moment getting used in machine imaginative and prescient, pictures and robotics by means of many researchers world wide.


  • Projective area, Bracket Algebra and Grassmann Cayley Algebra;
  • Projective occurrence Geometry with Cayley Bracket Algebra;
  • Projective Conic Geometry with Bracket Algebra and Quadratic Grassmann Cayley Algebra;
  • Inner-product Bracket Algebra and Clifford Algebra;
  • Geometric Algebra;
  • Euclidean Geometry and Conformal Grassmann Cayley Algebra;
  • Conformal Clifford Algebra and Classical Geometries.

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    Extra resources for Invariant Algebras And Geometric Reasoning

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    Being nilpotent, null vectors provide great benefits to algebraic manipulations, and as a result, long brackets composed of null vectors have much richer symmetries than those composed of other vectors. Null bracket algebra is a universal algebra of advanced invariants for classical metric geometries. It is also an algebra of advanced invariants for a class of nonclassical geometry – contact geometry, where all points, hyperplanes and spheres are represented by null vectors. 6 Geometric reasoning with advanced invariant algebras Geometric reasoning is a common task in mathematics education, computer-aided design, computer vision and robot navigation.

    The ten brackets are not algebraically independent. They satisfy five GP relations: [123][145] − [124][135] + [125][134] = 0, [123][245] − [124][235] + [125][234] = 0, [123][345] − [134][235] + [135][234] = 0, [124][345] − [134][245] + [145][234] = 0, [125][345] − [135][245] + [145][235] = 0. 11) The GP relations are not algebraically independent of each other. , the first three. For a finite set of generic generating vectors in V n , the bracket algebra they generate is an integral domain, and even a unique factorization domain (UFD).

    In representation, it refers to representing geometric constructions and relations multiplicatively, or more accurately, with as few terms as possible. In computation, it refers to eliminating most of the Z-grading operators from a graded Clifford monomial by generating a polynomial of long brackets with as few terms as possible, called least ungrading. Eliminating Z-grading operators is a way of prolonging the geometric product by breaking up the barriers to the associativity of the geometric product.

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