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0111 · Apr 200619922001200920172026
5 results for Freedman-Krushkal

2D complexes can be almost-embedded in 4D space without self-intersections.

problem Understanding the embedding properties of 2-dimensional complexes in 4-dimensional space.
method Analyzing specific 2-complexes constructed by Freedman-Krushkal-Teichner and showing they can be PL immersed in R4\mathbb{R}^4 without self-intersections.
result Many 2-complexes can be PL almost-embedded in R4\mathbb{R}^4 with singularities only as self-intersections of some 2-cells.

Let EMBED(k,d) be the following algorithmic problem: Given a finite simplicial complex K of dimension at most k, does there exist a (piecewise linear) embedding of K into R^d? Known results easily imply polynomiality of EMBED(k,2) (k=1,2; the case k=1, d=2 is graph planarity) and of EMBED(k,2k) for all k>2 (even if k i…

2008-07-02abs ↗pdf ↗

A clear understanding of topology of higher-dimensional objects is important in many branches of both pure and applied mathematics. In this survey we attempt to present some results of higher-dimensional topology in a way which makes clear the visual and intuitive part of the constructions and the arguments. In particu…

2006-04-03abs ↗pdf ↗