Dini's surface

Template:One source In mathematics, the reach of a subset of Euclidean space Rⁿ is a real number that roughly describes how curved the boundary of the set is.

Definition

Let X be a subset of Rⁿ. Then reach of X is defined as

${\text{reach}}(X):=\sup\{r\in \mathbb {R} :\forall x\in \mathbb {R} ^{n}\setminus X{\text{ with }}{\rm {dist}}(x,X)<r{\text{ exists a unique closest point }}y\in X{\text{ such that }}{\rm {dist}}(x,y)={\rm {dist}}(x,X)\}.$

Examples

Shapes that have reach infinity:

• single point
• straight line
• full square
• any convex set

The graph of ƒ(x) = |x| has reach zero.

A circle of radius r has reach r.

References

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