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In [[topology]], a branch of mathematics, '''Pachner moves''', named after Udo Pachner, are ways of replacing a [[triangulation (topology)|triangulation]] of a [[piecewise linear manifold]] by a different triangulation of a [[homeomorphism|homoeomorphic]] manifold. Pachner moves are also called '''bistellar flips'''. Any two triangulations of a piecewise linear manifold are related by a finite sequence of Pachner moves.


== Definition ==
Let <math>\Delta_{n+1}</math> be the <math>(n+1)</math>-[[simplex]].  <math>\partial \Delta_{n+1}</math> is a combinatorial ''n''-sphere with its triangulation as the boundary of the ''n+1''-simplex.


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Given a triangulated piecewise linear ''n''-manifold <math>N</math>, and a co-dimension ''0'' subcomplex <math>C \subset N</math> together with a simplicial isomorphism <math>\phi : C \to C' \subset \partial \Delta_{n+1}</math>, the Pachner move on ''N'' associated to ''C'' is the triangulated manifold <math>(N \setminus C) \cup_\phi (\partial \Delta_{n+1} \setminus C')</math>. By design, this manifold is PL-isomorphic to <math>N</math> but the isomorphism does not preserve the triangulation.
 
== References ==
*{{citation|first=Udo|last=Pachner|title=P.L. homeomorphic manifolds are equivalent by elementary shellings|journal=European Journal of Combinatorics|volume=12|issue=2|year=1991|pages=129–145}}.
 
[[Category:Topology]]
[[Category:Geometric topology]]
[[Category:Structures on manifolds]]

Revision as of 21:29, 1 November 2013

In topology, a branch of mathematics, Pachner moves, named after Udo Pachner, are ways of replacing a triangulation of a piecewise linear manifold by a different triangulation of a homoeomorphic manifold. Pachner moves are also called bistellar flips. Any two triangulations of a piecewise linear manifold are related by a finite sequence of Pachner moves.

Definition

Let Δn+1 be the (n+1)-simplex. Δn+1 is a combinatorial n-sphere with its triangulation as the boundary of the n+1-simplex.

Given a triangulated piecewise linear n-manifold N, and a co-dimension 0 subcomplex CN together with a simplicial isomorphism ϕ:CCΔn+1, the Pachner move on N associated to C is the triangulated manifold (NC)ϕ(Δn+1C). By design, this manifold is PL-isomorphic to N but the isomorphism does not preserve the triangulation.

References

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