On three dimensional stellar manifolds
On tolerances representable as $R \circ R^-$
On trigonometric-like decompositions of functions with respect to the cyclic group of order n
On Two of Erdös's Open Problems
One page proof of the Riemann hypothesis
Operations on fuzzy ideals of $Γ$-semirings
Optimal Plant Layout Design for Process-focused Systems
Optimum Statistical Test Procedure
Order in Dezert Smarandache Theory; definition of continuous Dezert Smarandache models
Orthogonal Basis and Motion in Finsler Geometry
Orthogonal matrices with rational components in composing tests for High School students
Orthonormal polynomials of several variables and Jacobian conjecture
Oscillating Population Models
Oversampling and transmission of hidden information