Covering R-trees

Covering R-trees, R-free groups, and dendrites

Covering shadows with a smaller volume

Covering spheres with spheres

Coxeter Decompositions of Bounded Hyperbolic Pyramids and Triangular Prisms

Coxeter decompositions of hyperbolic simplices

Coxeter polytopes with a unique pair of non-intersecting facets

Cremona Convexity, Frame Convexity, and a Theorem of Santaló

Critical potentials of the eigenvalues and eigenvalue gaps of Schrödinger operators

Critical values and level sets of distance functions in Riemannian, Alexandrov and Minkowski spaces

Crystal Frameworks, Matrix-valued Functions and Rigidity Operators

Cubic Polyhedra

Curvature bounded below: a definition a la Berg--Nikolaev

Curvature Bounds for Neighborhoods of Self-Similar Sets

Curvature densities of self-similar sets

Curvature extrema and four-vertex theorems for polygons and polyhedra

Curvature of sub-Riemannian spaces

Curvature-direction measures of self-similar sets

Curved Hexagonal Packings of Equal Disks in a Circle

Curves of constant diameter and inscribed polygons