👉 Semidecadently is a mathematical concept in algebraic geometry that describes the relationship between a curve and its tangent plane. It can be defined as follows: Let \(C\) be an algebraic curve (such as a conic section or a cubic surface) over a field of characteristic different from 2, and let \(\mathcal{P}\) denote the set of all points on the curve that are at a finite distance from a given point. A semidecadently defined
