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  2. Lattice path - Wikipedia

    en.wikipedia.org/wiki/Lattice_Path

    So the total number of lattice paths remains the same. Sets of NE lattice paths squared, with the second copy rotated 90° clockwise. Superimpose the NE lattice paths squared onto the same rectangular array, as seen in the figure below. We see that all NE lattice paths from (,) to (,) are accounted for. In particular, any lattice path passing ...

  3. Self-avoiding walk - Wikipedia

    en.wikipedia.org/wiki/Self-avoiding_walk

    In mathematics, a self-avoiding walk (SAW) is a sequence of moves on a lattice (a lattice path) that does not visit the same point more than once. This is a special case of the graph theoretical notion of a path. A self-avoiding polygon (SAP) is a closed self-avoiding walk on a lattice. Very little is known rigorously about the self-avoiding ...

  4. Delannoy number - Wikipedia

    en.wikipedia.org/wiki/Delannoy_number

    The Delannoy number (,) also counts the global alignments of two sequences of lengths and , [2] the points in an m-dimensional integer lattice or cross polytope which are at most n steps from the origin, [3] and, in cellular automata, the cells in an m-dimensional von Neumann neighborhood of radius n.

  5. Narayana number - Wikipedia

    en.wikipedia.org/wiki/Narayana_number

    For example, in the first path for ⁡ (,), the nodes 0 and 1 will have two children each; in the last (sixth) path, node 0 will have three children and node 1 will have one child. To construct a rooted tree from a lattice path and vice versa, we can employ an algorithm similar to the one mentioned the previous paragraph.

  6. Lindström–Gessel–Viennot lemma - Wikipedia

    en.wikipedia.org/wiki/Lindström–Gessel...

    An n-path from an n-tuple (,, …,) of vertices of G to an n-tuple (,, …,) of vertices of G will mean an n-tuple (,, …,) of paths in G, with each leading from to . This n -path will be called non-intersecting just in case the paths P i and P j have no two vertices in common (including endpoints) whenever i ≠ j {\displaystyle i\neq j} .

  7. Schröder number - Wikipedia

    en.wikipedia.org/wiki/Schröder_number

    The (large) Schröder numbers count both types of paths, and the little Schröder numbers count only the paths that only touch the diagonal but have no movements along it. [ 3 ] Just as there are (large) Schröder paths, a little Schröder path is a Schröder path that has no horizontal steps on the x {\displaystyle x} -axis.

  8. Brillouin zone - Wikipedia

    en.wikipedia.org/wiki/Brillouin_zone

    The reciprocal lattices (dots) and corresponding first Brillouin zones of (a) square lattice and (b) hexagonal lattice. In mathematics and solid state physics, the first Brillouin zone (named after Léon Brillouin) is a uniquely defined primitive cell in reciprocal space.

  9. Lattice model (physics) - Wikipedia

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

    In mathematical physics, a lattice model is a mathematical model of a physical system that is defined on a lattice, as opposed to a continuum, such as the continuum of space or spacetime. Lattice models originally occurred in the context of condensed matter physics , where the atoms of a crystal automatically form a lattice.

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