Number theory
      + Explicit Galois stable sets of algebraic integers in a given set of points
         (in preparation)

Category theory & K-theory
      + Grothendieck group of vector bundles over classifying spaces of
         compact Lie groups (ICTP Diploma 2000)
      + Logic in a topos (D.E.A. University of Yaounde I, 1998)
      + The category of measurable spaces (M.S. University of Yaounde I, 1997)

Numerical analysis & Potential theory
      + Computation of the Green's functions and logarithmic capacity
         (in preparation)