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Equimorphy versus Isomorphy Pouzet, Maurice
Description
Joint work wih Claude Laflamme, Norbert Sauer and Robert Woodrow. Two structures are said to be $\emph{equimorphic}$ if each embeds into the other. I will report on two conjectures about the number of structures (counted up to isomorphy) which are equimorphic to a given structure; one by Bonato and Tardif asking whether the number of trees equimorphic of a given tree is either $1$ or is infinite, the other by Thomass\'e asking a similar question for relational structures. I will present a positive answer of Thomass'e's conjecture for chains and for countable homogeneous structures (whose automorphism group is oligomorphic). I will conclude by some results about the hypergraph of copies of a countable homogeneous structure.
Item Metadata
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Equimorphy versus Isomorphy
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Creator | |
Publisher |
Banff International Research Station for Mathematical Innovation and Discovery
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Date Issued |
2015-11-11T11:17
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Description |
Joint work wih Claude Laflamme, Norbert Sauer and Robert Woodrow.
Two structures are said to be $\emph{equimorphic}$ if each embeds into the other. I will report on two conjectures about the number of structures (counted up to isomorphy) which are equimorphic to a given structure; one by Bonato and Tardif asking whether the number of trees equimorphic of a given tree is either $1$ or is infinite, the other by Thomass\'e asking a similar question for relational structures. I will present a positive answer of Thomass'e's conjecture for chains and for countable homogeneous structures (whose automorphism group is oligomorphic). I will conclude by some results about the hypergraph of copies of a countable homogeneous structure.
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Extent |
49 minutes
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Type | |
File Format |
video/mp4
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Language |
eng
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Notes |
Author affiliation: University Claude-Bernard, Lyon 1
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Series | |
Date Available |
2016-05-12
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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 |
10.14288/1.0302071
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Faculty
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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