# School of Mathematics

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## Prof H Dugald Macpherson

Professor of Pure Mathematics

Pure Mathematics

### Contact details

Room: Satellite 10.25

Tel: +44 (0)113 3435166

Email: H.D.MacPherson @ leeds.ac.uk

### Keywords

Model theory

Stability theory

O-minimal

Pseudofinite

Infinite permutation group

Homogeneous structure

Valued field

Vapnik-Chervonenkis density

## Research interests

I work in model theory (mathematical logic) and adjacent areas of permutation group theory and combinatorics. Particular interests include the following.

1. Model theory of valued fields, from the viewpoint of generalised stability theory -- issues around definability in henselian fields.

2. Generalisations of o-minimality (structure theory arising from restrictions on one-variable definable sets).

3. Model theory of finite (and pseudofinite) structures -- for example, model-theoretic consequences of asymptotic uniformities on sizes of definable sets.

4. Model theory of groups -- e.g. groups in stable and simple theories, model theory of finite groups.

5. Abstract model theory -- generalisations of stability, connections to combinatorial conditions such as Vapnik-Chevonenkis density.

6. Infinite permutation groups -- often arising as automorphism groups of first order structures.

7. Homogeneous structures, in the sense of Fraisse. There are connections to permutation groups and combinatorics, and more recent connections to Ramsey theory, topological dynamics, and constraint satisfaction.

### Useful links

MALOA Initial Training Network

Personal Home Page

British Logic Colloquium

Leeds Logic Group

## Current postgraduate students

Ricardo Bello Aguirre (2012)

David Bradley-Williams (2009)

Erick Garcia Ramirez (2013)

Daoud Siniora (2013)

Daniel Wolf (2012)

## Publications

**Macpherson HD; Aschenbrenner M; Dolich A; Haskell D; Starchenko S ** Vapnik-Chervonenkis density in some theories without the independence property, I. 2013

**Macpherson HD; Aschenbrenner, M; Dolich, A; Haskell, D; Starchenko, S** Vapnik-Chervonenkis density in some theories without the Independence Property, II *Notre Dame Journal of Formal Logic*, 2013

**Macpherson HD; Haskell D; Hrushovski E** Unexpected imaginaries in valued fields with analytic structure *The Journal of Symbolic Logic*, **78**, 523-542, 2013

DOI:10.2178/jsl.7802100

**Lockett DC; Macpherson HD** Orbit-equivalent infinite permutation groups *Journal of Algebraic Combinatorics*, 1-16, 2013

DOI:10.1007/s10801-013-0434-0

View abstract

**Macpherson HD; Gray R; Praeger CE; Royle GF** Set-homogeneous directed graphs *Journal of Combinatorial Theory, Series B*, **102**, 474-520, 2011

DOI:10.1016/j.jctb.2011.08.002

View abstract

**Macpherson HD; Elwes R; Jaligot E; Ryten MJ** Groups in supersimple and pseudofinite theories *Proceedings of the London Mathematical Society*, **103**, 1049-1082, 2011

DOI:10.1112/plms/pdr002

View abstract

**Macpherson HD; Steinhorn C** Definability in classes of finite structures In *Finite and Algorithmic Model Theory*, **379**, 140-173, 2011

**Macpherson HD** A survey of homogeneous structures *Discrete Mathematics*, **311**, 1599-1634, 2011

DOI:10.1016/j.disc.2011.01.024

View abstract

**Macpherson HD; Tent K** Simplicity of some automorphism groups *Journal of Algebra*, **342**, 40-52, 2011

DOI:10.1016/j.jalgebra.2011.05.021

View abstract

**Macpherson HD; Liebeck MW; Tent K** Primitive permutation groups of bounded orbital diameter *Proceedings of the London Mathematical Society (3)*, **100**, 216-248, 2009

DOI:10.1112/plms/pdp024

**Macpherson HD; Gray R** Countable connected-homogeneous graphs *Journal of Combinatorial Theory, Series B*, **100**, 97-118, 2009

DOI:10.1016/j.jctb.2009.04.002

View abstract

**Macpherson HD; Elwes R** A survey of asymptotic classes and measurable structures In *Model theory with applications to algebra and analysis*, **350**, 125-159, 2008

**Macpherson HD; Steinhorn C** One-dimensional asymptotic classes of finite structures *Transactions of the American Mathematical Society*, **360**, 411-448, 2007

**Macpherson HD; Steinhorn C ** One-dimensional asymptotic classes of finite structures. 2007

DOI:10.1090/S0002-9947-07-04382-6

**Haskell D; Hrushovski E; Macpherson HD ** *Stable domination and independence in algebraically closed valued fields*. Cambridge University Press 2007

**Haskell D; Hrushovski E; Macpherson HD** Definable sets in algebraically closed valued fields: elimination of imaginaries *Journal für die Reine und Angewandte Mathematik*, **2006**, 175-236

DOI:10.1515/CRELLE.2006.066

**Macpherson HD; Tent K** Stable pseudofinite groups *Journal of Algebra*, 2006

**Bhattacharjee M; Macpherson HD** Jordan groups and limits of betweenness relations *Journal of Group Theory*, **9**, 59-94, 2006

DOI:10.1515/JGT.2006.004

**Barbina S; Macpherson HD** Reconstruction of homogeneous relational structures *Journal of Symbolic Logic*, 2005

**Bhattacharjee M; Macpherson HD** A locally finite dense group acting on the random graph *Forum Mathematicum*, **17**, 513-517, 2005

DOI:10.1515/form.2005.17.3.513

**Kulpeshov BS; Macpherson HD** Minimality conditions on circularly ordered structures *MATH LOGIC QUART*, **51**, 377-399, 2005

DOI:10.1002/malq.200410040

**Haskell D; Macpherson HD** Definable sets in valued fields In *Model theory and applications*, **11**, 117-149, 2005

**Macpherson HD; Thomas S** Comeagre conjugacy classes and free products with amalgamation *Discrete Mathematics*, **291**, pp.135--142, 2005

DOI:10.1016/j.disc.2004.04.025

**Herwig BF; Hrushovski E; Macpherson HD** Interpretable groups, stably embedded sets and Vaughtian pairs *Journal of London Mathematical Society*, **68**, 1-11, 2003

**Bhattacharjee M; Macpherson HD** Strange permutation represntations of free groups *Journal of the Australian Mathematical Society. Series B. Applied Mathematics*, **74**, 267-285, 2003

**Droste M; Macpherson HD; Mekler AH** Uncountable homogenous partial orders *Mathematical Logic Quarterly*, **48**, 525-532, 2002

**Macpherson HD; Mosley A; Tent K** Permutation groups in o-minimal structures *Journal of London Mathematical Society*, 2000

**Macpherson HD; Marker D; Steinhorn C** Weakly o-minimal structures and real closed fields *Transactions of the American Mathematical Society*, **352**, 5435-5483, 2000

**Macpherson HD; van den Dries L; Haskell D** One-dimensional p-adic subanalytic sets *Journal of London Mathematical Society*, **59**, 1-20, 1999

**Guralnick RM; Liebeck MW; Macpherson HD; Seitz GM** Modules for algebraic groups with finitely many orbits on subspaces *Journal of Algebra*, **196**, 211-250, 1997

**Macpherson HD; Steinhorn C** On variants of o-minimality *Annals of Pure and Applied Logic*, **79**, 165-209, 1996

**Kudaibergenov K; Macpherson HD** On model companions for structures with an automorphism *None*, 1-15

Macpherson HD; Tent K Pseudofinite groups with NIP theory and definability in finite simple groups.

**Macpherson HD; Aschenbrenner M; Dolich A; Haskell D; Starchenko S** Vapnik-Chervonenkis density in some theories without the independence property, I *Transactions of the American Mathematical Society*

View abstract

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