Radii of regular polytopes

Ramanujan type $1/π$ Approximation Formulas

Ramanujan's Heirs

Random matrices and Riemann hypothesis

Random triangle problem: geometrical approach

Rank Distance Bicodes and their Generalization

Ranking Participants in Tournaments by means of Rating Functions

Ratio Estimators in Simple Random Sampling Using Information on Auxiliary Attribute

Ratio Estimators in Simple Random Sampling when Study Variable is an Attribute

Realization of the Riemann Hypothesis via Coupling Constant Spectrum

Reciprocal Properties of Pythagorean triangles

Recurrence Divisibility Tests

Recursion and the Axiom of Infinity

Recursion and w-order

Recursion Relations and Functional Equations for the Riemann Zeta Function

Redundancies : An Omission in Probability Theory ?

Refinement of Inequalities among Means

Relations on Intuitionistic Fuzzy Soft Sets

Remark on Cavalieri's Quadrature Formula

Remarks on Cantor's diagonalization proof of 1891