In mathematics, the Minkowski–Steiner formula is a formula relating the surface area and volume of compact subsets of Euclidean space. More precisely, it defines the surface area as the "derivative" of enclosed volume in an appropriate sense.
Contents
- Statement of the Minkowski Steiner formula
- Surface measure
- Convex sets
- Example volume and surface area of a ball
- References
The Minkowski–Steiner formula is used, together with the Brunn–Minkowski theorem, to prove the isoperimetric inequality. It is named after Hermann Minkowski and Jakob Steiner.
Statement of the Minkowski-Steiner formula
Let
where
denotes the closed ball of radius
is the Minkowski sum of
Surface measure
For "sufficiently regular" sets
Convex sets
When the set
where the
where
Example: volume and surface area of a ball
Taking
where