raadiusel

Raadiusel is a term that first appeared in the early 1990s in the field of theoretical geometry. It was coined by the South Korean mathematician Jae‑soo Kim, who used the word to describe a special class of quasi‑spherical surfaces that display a unique symmetry combining aspects of both elliptic and hyperbolic shapes. Although the concept has not entered mainstream mathematical literature, it has been cited in a number of niche research papers examining the properties of three‑dimensional manifolds and their applications to complex systems.

The defining feature of a raadiusel surface is its constant Gaussian curvature, which alternates between positive and negative values across the manifold. This alternating curvature creates a natural lattice structure that has been proposed as a model for understanding certain polymer chains and crystalline defects. Some computational scientists have also explored raadiusel configurations in the context of 3D printing, arguing that the geometry can lead to lightweight yet structurally robust designs.

Despite its potential, the term raadiusel remains largely theoretical. It has not been widely adopted in engineering or physics, and there is no standard textbook that covers it comprehensively. Nevertheless, the concept continues to attract interest from a small group of researchers interested in the intersection of geometry, materials science, and computational modeling.