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  2. Lattice constant - Wikipedia

    en.wikipedia.org/wiki/Lattice_constant

    A simple cubic crystal has only one lattice constant, the distance between atoms, but in general lattices in three dimensions have six lattice constants: the lengths a, b, and c of the three cell edges meeting at a vertex, and the angles α, β, and γ between those edges. The crystal lattice parameters a, b, and c have the

  3. Map of lattices - Wikipedia

    en.wikipedia.org/wiki/Map_of_lattices

    A relatively complemented lattice is a lattice. (def) 19. A heyting algebra is distributive. [5] 20. A totally ordered set is a distributive lattice. 21. A metric lattice is modular. [6] 22. A modular lattice is semi-modular. [7] 23. A projective lattice is modular. [8] 24. A projective lattice is geometric. (def) 25. A geometric lattice is ...

  4. Lattice model (physics) - Wikipedia

    en.wikipedia.org/wiki/Lattice_model_(physics)

    Physical lattice models frequently occur as an approximation to a continuum theory, either to give an ultraviolet cutoff to the theory to prevent divergences or to perform numerical computations. An example of a continuum theory that is widely studied by lattice models is the QCD lattice model, a discretization of quantum chromodynamics.

  5. Crystal structure - Wikipedia

    en.wikipedia.org/wiki/Crystal_structure

    The geometry of the unit cell is defined as a parallelepiped, providing six lattice parameters taken as the lengths of the cell edges (a, b, c) and the angles between them (α, β, γ). The positions of particles inside the unit cell are described by the fractional coordinates ( x i , y i , z i ) along the cell edges, measured from a reference ...

  6. Hermite constant - Wikipedia

    en.wikipedia.org/wiki/Hermite_constant

    In mathematics, the Hermite constant, named after Charles Hermite, determines how long a shortest element of a lattice in Euclidean space can be. The constant γ n for integers n > 0 is defined as follows. For a lattice L in Euclidean space R n with unit covolume, i.e. vol(R n /L) = 1, let λ 1 (L) denote the least length of a nonzero element of L.

  7. Free lattice - Wikipedia

    en.wikipedia.org/wiki/Free_lattice

    Two well-formed words v and w in W(X) denote the same value in every bounded lattice if and only if w ≤ ~ v and v ≤ ~ w; the latter conditions can be effectively decided using the above inductive definition. The table shows an example computation to show that the words x∧z and x∧z∧(x∨y) denote the same value in every bounded lattice ...

  8. Geometric lattice - Wikipedia

    en.wikipedia.org/wiki/Geometric_lattice

    In the mathematics of matroids and lattices, a geometric lattice is a finite atomistic semimodular lattice, ... an example is the Vámos matroid. [6]

  9. Complete lattice - Wikipedia

    en.wikipedia.org/wiki/Complete_lattice

    The mathematics behind formal concept analysis therefore is the theory of complete lattices. Another representation is obtained as follows: A subset of a complete lattice is itself a complete lattice (when ordered with the induced order) if and only if it is the image of an increasing and idempotent (but not necessarily extensive) self-map. The ...

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