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Embeddings of k-complexes into 2k-manifolds Tancer, Martin
Description
Let $K$ be a simplicial $k$-complex and $M$ be a closed PL $2k$-manifold. Our first aim during the talk is to describe an obstruction for embeddability of $K$ into $M$ via the intersection form on $M$. For description of the obstruction, we need a technical condition which is satisfied, in particular, either if $M$ is $(k-1)$-connected or if $K$ is the $k$-skeleton of $n$-simplex, for some $n$. Under the technical condition, if $K$ (almost) embeds in $M$, then our obstruction vanishes. In addition, if $M$ is $(k-1)$-connected and $k \geq 3$, then the obstruction is complete, that is, we get the reverse implication. Modulo a recent hard Lefschetz theorem of Adiprasito, a consequence of our results on the existence and completeness of the obstruction are very good bounds on the Helly number in a certain Helly type theorem where the ambient space is a (suitable) manifold. The details will be explained during the talk. The talk is based on a joint work with Pavel Paták.
Item Metadata
Title |
Embeddings of k-complexes into 2k-manifolds
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Creator | |
Publisher |
Banff International Research Station for Mathematical Innovation and Discovery
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Date Issued |
2019-10-10T11:00
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Description |
Let $K$ be a simplicial $k$-complex and $M$ be a closed PL
$2k$-manifold. Our first aim during the talk is to describe an obstruction
for embeddability of $K$ into $M$ via the intersection form on $M$. For
description of the obstruction, we need a technical condition which is
satisfied, in particular, either if $M$ is $(k-1)$-connected or if $K$ is the
$k$-skeleton of $n$-simplex, for some $n$. Under the technical condition, if $K$
(almost) embeds in $M$, then our obstruction vanishes. In addition, if $M$ is
$(k-1)$-connected and $k \geq 3$, then the obstruction is complete, that is,
we get the reverse implication.
Modulo a recent hard Lefschetz theorem of Adiprasito, a consequence of our
results on the existence and completeness of the obstruction are very good
bounds on the Helly number in a certain Helly type theorem where the
ambient space is a (suitable) manifold. The details will be explained
during the talk.
The talk is based on a joint work with Pavel Paták.
|
Extent |
46.0 minutes
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Subject | |
Type | |
File Format |
video/mp4
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Language |
eng
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Notes |
Author affiliation: Charles University in Prague
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Series | |
Date Available |
2021-01-13
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0395565
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Researcher
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International