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  2. Lattice (group) - Wikipedia

    en.wikipedia.org/wiki/Lattice_(group)

    The rhombic lattices are represented by the points on its boundary, with the hexagonal lattice as vertex, and i for the square lattice. The rectangular lattices are at the imaginary axis, and the remaining area represents the parallelogrammatic lattices, with the mirror image of a parallelogram represented by the mirror image in the imaginary axis.

  3. Lattice (order) - Wikipedia

    en.wikipedia.org/wiki/Lattice_(order)

    In particular, a bounded-lattice homomorphism (usually called just "lattice homomorphism") between two bounded lattices and should also have the following property: =, =. In the order-theoretic formulation, these conditions just state that a homomorphism of lattices is a function preserving binary meets and joins.

  4. Lattice (discrete subgroup) - Wikipedia

    en.wikipedia.org/wiki/Lattice_(discrete_subgroup)

    Lattices are best thought of as discrete approximations of continuous groups (such as Lie groups). For example, it is intuitively clear that the subgroup of integer vectors "looks like" the real vector space in some sense, while both groups are essentially different: one is finitely generated and countable, while the other is not finitely generated and has the cardinality of the continuum.

  5. Bravais lattice - Wikipedia

    en.wikipedia.org/wiki/Bravais_lattice

    The seven lattice systems and their Bravais lattices in three dimensions. In geometry and crystallography, a Bravais lattice, named after Auguste Bravais (), [1] is an infinite array of discrete points generated by a set of discrete translation operations described in three dimensional space by

  6. Complete lattice - Wikipedia

    en.wikipedia.org/wiki/Complete_lattice

    A conditionally complete lattice satisfies at least one of these properties for bounded subsets. For comparison, in a general lattice, only pairs of elements need to have a supremum and an infimum. Every non-empty finite lattice is complete, but infinite lattices may be incomplete.

  7. Unimodular lattice - Wikipedia

    en.wikipedia.org/wiki/Unimodular_lattice

    An integral lattice is unimodular if its determinant is 1 or −1. A unimodular lattice is even or type II if all norms are even, otherwise odd or type I. The minimum of a positive definite lattice is the lowest nonzero norm. Lattices are often embedded in a real vector space with a symmetric bilinear form.

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