Generalized manifolds in products of curves

Akira Koyama, Józef Krasinkiewicz, Stanislaw Spiez

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The intent of this article is to distinguish and study some ndimensional compacta (such as weak n-manifolds) with respect to embeddability into products of n curves. We show that if X is a locally connected weak n-manifold lying in a product of n curves, then rank H1(X) ≥ n. If rankH1(X) = n, then X is an n-torus. Moreover, if rank H1(X) < 2n, then X can be presented as a product of an m-torus and a weak (n-m)-manifold, where m ≥ 2n - rank H1(X). If rank H1(X) < ∞, then X is a polyhedron. It follows that certain 2-dimensional compact contractible polyhedra are not embeddable in products of two curves. On the other hand, we show that any collapsible 2-dimensional polyhedron embeds in a product of two trees. We answer a question of Cauty proving that closed surfaces embeddable in a product of two curves embed in a product of two graphs. We construct a 2-dimensional polyhedron that embeds in a product of two curves but does not embed in a product of two graphs. This solves in the negative another problem of Cauty. We also construct a weak 2-manifold X lying in a product of two graphs such that H2(X) = 0.

Original languageEnglish
Pages (from-to)1509-1532
Number of pages24
JournalTransactions of the American Mathematical Society
Volume363
Issue number3
DOIs
Publication statusPublished - 2011 Mar
Externally publishedYes

Fingerprint

Curve
Polyhedron
Torus
Graph in graph theory
Embeddability
Locally Connected
Closed

Keywords

  • Embeddings
  • Locally connected compacta
  • Products of curves
  • Weak manifolds

ASJC Scopus subject areas

  • Mathematics(all)
  • Applied Mathematics

Cite this

Generalized manifolds in products of curves. / Koyama, Akira; Krasinkiewicz, Józef; Spiez, Stanislaw.

In: Transactions of the American Mathematical Society, Vol. 363, No. 3, 03.2011, p. 1509-1532.

Research output: Contribution to journalArticle

Koyama, Akira ; Krasinkiewicz, Józef ; Spiez, Stanislaw. / Generalized manifolds in products of curves. In: Transactions of the American Mathematical Society. 2011 ; Vol. 363, No. 3. pp. 1509-1532.
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