1. EXISTENCE AND MULTIPLICITY OF POSITIVE RADIAL SOLUTIONS TO THE DIRICHLET PROBLEM FOR NONLINEAR ELLIPTIC EQUATIONS ON ANNULAR DOMAINS. Authors: NOUREDDINE BOUTERAA, SLIMANE BENAICHA.2. A STUDY OF EXISTENCE AND MULTIPLICITY OF POSITIVE SOLUTIONS FOR NONLINEAR FRACTIONAL DIFFERENTIAL EQUATIONS WITH NONLOCAL BOUNDARY CONDITIONS. Authors: SLIMANE BENAICHA, NOUREDDINE BOUTERAA.3. POSITIVE SOLUTIONS FOR FRACTIONAL DI_ERENTIAL EQUATIONS WITH NON-SEPARATED TYPE NONLOCAL MULTI-POINT AND MULTI-TERM INTEGRAL BOUNDARY CONDITIONS. Authors: HABIB DJOURDEM, SLIMANE BENAICHA.