Contrary to a certain traditional conception dating back at least to Locke, everyday linguistic communication is not a simple matter of putting one's thoughts into words for one's audience to put back into thoughts. This naive " code model " misses the fact that what a speaker means in uttering a sentence can be distinct in various ways from what the sentence means. She might not mean what she ...

Performance tuning on today`s computers has become very complex. One of the factor of this complexity is the use of memory hierarchies, and particularly of cache memories. Code transformations such as loop blocking are used for improving temporal locality in numerical codes. Unfortunately, the behavior of direct-mapped caches and set-associative caches are very sensitive to parameters such as t...

The cohomology of the BRS operator corresponding to a group of rigid symmetries is studied in a space of local field functionals subjected to a condition of gauge invariance. We propose a procedure based on a filtration operator counting the degree in the infinitesimal parameters of the rigid symmetry transformations. An application to Witten’s topological Yang-Mills theory is given. Supported ...

In this thesis, we study continuum tree-valued processes. First, we define anabstract framework for these processes, by constructing a metric on the space of locally com-pact, complete R-trees, endowed with a locally finite Borel measure. This topology, calledGromov-Hausdorff-Prokhorov topology, allows for the definition of tree-valued Markov pro-cesses. We then give a new const...