A surface area formula for compact hypersurfaces in $\mathbb{R}^n$
Abstrak
The classical result of Cauchy's surface area formula states that the surface area of the boundary $\partial K=Σ$ of any $n$-dimensional convex body in the $n$-dimensional Euclidean space $\mathbb{R}^n$ can be obtained by the average of the projected areas of $Σ$ along all directions in $\mathbb{S}^{n-1}$. In this notes, we generalize the formula to the boundary of arbitrary $n$-dimensional submanifolds in $\mathbb{R}^n$ by defining a natural notion of projected areas along any direction in $\mathbb{S}^{n-1}$. This surface area formula derived from the new concept coincides with not only the result of the Crofton's formula but that of De Jong \cite{de2013volume} by using tubular neighborhood. We also define the projected $r$-volumes of $Σ$ onto any $r$-dimensional subspaces, and obtain a recursive formula for mean projected $r$-volumes of $Σ$.
Topik & Kata Kunci
Penulis (1)
Yen-Chang Huang
Akses Cepat
- Tahun Terbit
- 2023
- Bahasa
- en
- Sumber Database
- arXiv
- Akses
- Open Access ✓