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Title: Reducts of aleph_zero-categorical structures
Author: Agarwal, Lovkush
ISNI:       0000 0004 5990 2500
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2016
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Given two structures M and N on the same domain, we say that N is a reduct of M if all emptyset-definable relations of N are emptyset-definable in M. In this thesis, the reducts of the generic digraph, the Henson digraphs, the countable vector space over F_2 and of the linear order Q.2 are classified up to first-order interdefinability. These structures are aleph_zero-categorical, so classifying their reducts is equivalent to classifying the closed groups that lie in between the structures’ automorphism groups and the full symmetric group.
Supervisor: Truss, John Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available