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- Gruenbaum's inequality for projections
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Gruenbaum's inequality for projections Stephen, Matthew
Description
Let $K$ be a convex body in $\mathbb{R}^n$ whose centroid is at the origin, let $E\in G(n,k)$ be a subspace, and let $\xi\in S^{n-1}$. I will discuss my joint work with Ning Zhang, where we found the best constant $c = \left(\frac{k}{n+1}\right)^k$ so that $|(K|E)\cap\xi^+|_k\geq c\,|K|E|_k$. Here, $|\cdot|_k$ is $k$-dimensional volume, $K|E$ is the projection of $K$ onto $E$, and $\xi^+ = \{ x\in\mathbb{R}^n:\, \langle x,\xi\rangle\geq 0\}$. Our result generalizes both Gr\"unbaum's inequality, and an old inequality of Minkowski and Radon.
Item Metadata
Title |
Gruenbaum's inequality for projections
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Creator | |
Publisher |
Banff International Research Station for Mathematical Innovation and Discovery
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Date Issued |
2017-05-25T14:06
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Description |
Let $K$ be a convex body in $\mathbb{R}^n$ whose centroid is at the origin, let $E\in G(n,k)$ be a subspace, and let $\xi\in S^{n-1}$. I will discuss my joint work with Ning Zhang, where we found the best constant $c = \left(\frac{k}{n+1}\right)^k$ so that $|(K|E)\cap\xi^+|_k\geq c\,|K|E|_k$. Here, $|\cdot|_k$ is $k$-dimensional volume, $K|E$ is the projection of $K$ onto $E$, and $\xi^+ = \{ x\in\mathbb{R}^n:\, \langle x,\xi\rangle\geq 0\}$. Our result generalizes both Gr\"unbaum's inequality, and an old inequality of Minkowski and Radon.
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Extent |
30 minutes
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Subject | |
Type | |
File Format |
video/mp4
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Language |
eng
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Notes |
Author affiliation: University of Alberta
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Series | |
Date Available |
2017-11-23
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Provider |
Vancouver : University of British Columbia Library
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Rights |
Attribution-NonCommercial-NoDerivatives 4.0 International
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DOI |
10.14288/1.0360662
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URI | |
Affiliation | |
Peer Review Status |
Unreviewed
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Scholarly Level |
Graduate
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Rights URI | |
Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
Attribution-NonCommercial-NoDerivatives 4.0 International