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- Jakub Jasinski, Claude Laflamme, Lionel Nguyen Van Thé, Robert E. Woodrow
- Electr. J. Comb.
- 2014

In 2005, Kechris, Pestov and Todorčević provided a powerful tool to compute an invariant of topological groups known as the universal minimal flow, immediately leading to an explicit representation… (More)

- Claude Laflamme, Lionel Nguyen Van Thé, Norbert Sauer
- Electr. J. Comb.
- 2010

The distinguishing number of a graph G is the smallest positive integer r such that G has a labeling of its vertices with r labels for which there is no non-trivial automorphism of G preserving these… (More)

- Lionel Nguyen Van Thé
- Eur. J. Comb.
- 2009

We study Ramsey-theoretic properties of several natural classes of finite ultrametric spaces, describe the corresponding Urysohn spaces and compute a dynamical invariant attached to their isometry… (More)

We prove that if the universalminimal flow of a Polish groupG ismetrizable and contains a Gδ orbit G · x0, then it is isomorphic to the completion of the homogeneous space G/Gx0 and show how this… (More)

- Claude Laflamme, Lionel Nguyen Van Thé, Maurice Pouzet, Norbert Sauer
- J. Comb. Theory, Ser. A
- 2011

8 We investigate infinite versions of vector and affine space partition 9 results, and thus obtain examples and a counterexample for a parti10 tion problem for relational structures. In particular we… (More)

- Claude Laflamme, Lionel Nguyen Van Thé, Norbert Sauer
- Combinatorica
- 2010

We study finite dimensional partition properties of the countable homogeneous dense local order (a directed graph closely related to the order structure of the rationals). Some of our results use… (More)

- Lionel Nguyen Van Thé, H F Murk
- The British journal of dermatology
- 1979

We study the oscillation stability problem for the Urysohn sphere, an analog of the distortion problem for ℓ 2 in the context of the Urysohn space U. In particular, we show that this problem reduces… (More)

We study the oscillation stability problem for the Urysohn sphere, an analog of the distortion problem for ℓ 2 in the context of the Urysohn space U. In particular, we show that this problem reduces… (More)

- Lionel Nguyen Van Thé
- Contributions to Discrete Mathematics
- 2010

Given a fixed integer n, we prove Ramsey-type theorems for the classes of all finite ordered n-colorable graphs, finite n-colorable graphs, finite ordered n-chromatic graphs, and finite n-chromatic… (More)