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  2. Lattice (order) - Wikipedia

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

    A lattice is an abstract structure studied in the mathematical subdisciplines of order theory and abstract algebra.It consists of a partially ordered set in which every pair of elements has a unique supremum (also called a least upper bound or join) and a unique infimum (also called a greatest lower bound or meet).

  3. Map of lattices - Wikipedia

    en.wikipedia.org/wiki/Map_of_lattices

    An algebraic lattice is complete. (def) 10. A complete lattice is bounded. 11. A heyting algebra is bounded. (def) 12. A bounded lattice is a lattice. (def) 13. A heyting algebra is residuated. 14. A residuated lattice is a lattice. (def) 15. A distributive lattice is modular. [3] 16. A modular complemented lattice is relatively complemented ...

  4. Lattice (discrete subgroup) - Wikipedia

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

    Let be a locally compact group and a discrete subgroup (this means that there exists a neighbourhood of the identity element of such that = {}).Then is called a lattice in if in addition there exists a Borel measure on the quotient space / which is finite (i.e. (/) < +) and -invariant (meaning that for any and any open subset / the equality () = is satisfied).

  5. Lattice of subgroups - Wikipedia

    en.wikipedia.org/wiki/Lattice_of_subgroups

    Lattice-theoretic information about the lattice of subgroups can sometimes be used to infer information about the original group, an idea that goes back to the work of Øystein Ore (1937, 1938). For instance, as Ore proved , a group is locally cyclic if and only if its lattice of subgroups is distributive .

  6. Modular lattice - Wikipedia

    en.wikipedia.org/wiki/Modular_lattice

    The lattice of submodules of a module over a ring is modular. As a special case, the lattice of subgroups of an abelian group is modular. The lattice of normal subgroups of a group is modular. But in general the lattice of all subgroups of a group is not modular. For an example, the lattice of subgroups of the dihedral group of order 8 is not ...

  7. Metric lattice - Wikipedia

    en.wikipedia.org/wiki/Metric_lattice

    [2]: 126 A function satisfies the one-dimensional wave equation if and only if it is a valuation for the lattice of spacetime coordinates with the natural partial order. A similar result should apply to any partial differential equation solvable by the method of characteristics, but key features of the theory are lacking. [2]: 150–151

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