Yves Le Grand and the dioptric power matrix

Corneal dioptric power after penetrating keratoplasty.

The dioptric power of the cornea (spherical equivalent) was studied in 60 eyes operated on for penetrating keratoplasty. In order to determine the possible influence of (1) the underlying pathology, (2) the presence of neovascularisation, or (3) the size of the graft the sample was divided into four groups, with the following results: group A (keratoconus, same-sized graft) = 42.25 D; group B (...

Le grand Autre: The Symbolic Order of Ideology

Correlation between the dioptric power, astigmatism and surface shape of the anterior and posterior corneal surfaces.

A knowledge of the shape of the cornea is of major importance for the planning and monitoring of surgery, and for the correct diagnosis of corneal diseases. Many authors have studied the geometry of the second corneal surface in the central region and it has been stated that there is a high correlation between the central radii of curvature and asphericities of the two corneal surfaces. In this...

A ug 2 00 8 MARKOV PATHS , LOOPS AND FIELDS ( Preliminary version ) Yves Le Jan

We study the Poissonnian ensembles of Markov loops and the associated renormalized self intersection local times.

Quasi exactly solvable matrix Schrödinger operators . Yves BRIHAYE Faculté

Two families of quasi exactly solvable 2 × 2 matrix Schrödinger operators are constructed. The first one is based on a polynomial matrix potential and depends on three parameters. The second is a one-parameter generalisation of the scalar Lamé equation. The relationship between these operators and QES Hamiltonians already considered in the literature is pointed out.