Convergence of a Family of Series

Convexity of Sub-polygons of Convex Polygons

Correcting a minor error in Cantor's calculation of the power of the continuum

Correction to a theorem of Schoenberg

Correspondence principle for idempotent calculus and some computer applications

Countability of the Real Numbers

Counting all equilateral triangles in {0,1,2,...,n}^3

Counting systems and the First Hilbert problem

Coxeter groups of stellar manifolds

Crisis in the geometry development and its social consequences

Criteria of Primality

Current Mathematics Appears to Be Inconsistent

Cutting Cakes Correctly

Decartes' Perfect Lens

Deducibility Theorems in Boolean Logic

Definition and Existence of the Eigenderivative

Definitions Derived from Neutrosophics

Deformation principle and problem of parallelism in geometry and physics

Deformation principle as a foundation of physical geometry

Deformations and Inversion Formulas For Formal Automorphisms in Noncommutative Variables