<p>Let <InlineEquation ID="IEq1"> <EquationSource Format="MATHML"><math> <mi>K</mi> </math></EquationSource> <EquationSource Format="TEX">$K$</EquationSource> </InlineEquation> be a convex body in <InlineEquation ID="IEq2"> <EquationSource Format="MATHML"><math> <msup> <mi mathvariant="double-struck">R</mi> <mi>n</mi> </msup> </math></EquationSource> <EquationSource Format="TEX">$\mathbb{R}^{n}$</EquationSource> </InlineEquation>. A diametral Santaló point of <InlineEquation ID="IEq3"> <EquationSource Format="MATHML"><math> <mi>K</mi> </math></EquationSource> <EquationSource Format="TEX">$K$</EquationSource> </InlineEquation> is defined as a minimizer of <InlineEquation ID="IEq4"> <EquationSource Format="MATHML"><math> <msub> <mi mathvariant="fraktur">f</mi> <mi>K</mi> </msub> <mo stretchy="false">(</mo> <mi>u</mi> <mo stretchy="false">)</mo> <mo>:</mo> <mo>=</mo> <mi mathvariant="normal">diam</mi> <mo stretchy="false">(</mo> <msup> <mrow> <mo stretchy="false">(</mo> <mi>K</mi> <mo>−</mo> <mi>u</mi> <mo stretchy="false">)</mo> </mrow> <mo>∘</mo> </msup> <mo stretchy="false">)</mo> </math></EquationSource> <EquationSource Format="TEX">$\mathfrak{f}_{K}(u):={\mathrm{diam}} ((K-u)^{\circ })$</EquationSource> </InlineEquation> with respect to <InlineEquation ID="IEq5"> <EquationSource Format="MATHML"><math> <mi>u</mi> <mo>∈</mo> <mi mathvariant="normal">int</mi> <mo stretchy="false">(</mo> <mi>K</mi> <mo stretchy="false">)</mo> </math></EquationSource> <EquationSource Format="TEX">$u \in {\mathrm{int}}(K)$</EquationSource> </InlineEquation>. The set <InlineEquation ID="IEq6"> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Φ</mi> <mo stretchy="false">(</mo> <mi>K</mi> <mo stretchy="false">)</mo> </math></EquationSource> <EquationSource Format="TEX">$\Phi (K)$</EquationSource> </InlineEquation> of diametral Santaló points of <InlineEquation ID="IEq7"> <EquationSource Format="MATHML"><math> <mi>K</mi> </math></EquationSource> <EquationSource Format="TEX">$K$</EquationSource> </InlineEquation> can be viewed as a sort of central region of <InlineEquation ID="IEq8"> <EquationSource Format="MATHML"><math> <mi>K</mi> </math></EquationSource> <EquationSource Format="TEX">$K$</EquationSource> </InlineEquation>. The study of this concept of centrality was initiated in a recent work of ours, entitled “Diametral Santaló points of convex bodies” and published in Aequationes Mathematicae. The present work analyzes the function <InlineEquation ID="IEq9"> <EquationSource Format="MATHML"><math> <msub> <mi mathvariant="fraktur">f</mi> <mi>K</mi> </msub> </math></EquationSource> <EquationSource Format="TEX">$\mathfrak{f}_{K}$</EquationSource> </InlineEquation> and set <InlineEquation ID="IEq10"> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">Φ</mi> <mo stretchy="false">(</mo> <mi>K</mi> <mo stretchy="false">)</mo> </math></EquationSource> <EquationSource Format="TEX">$\Phi (K)$</EquationSource> </InlineEquation> under the assumption that <InlineEquation ID="IEq11"> <EquationSource Format="MATHML"><math> <mi>K</mi> </math></EquationSource> <EquationSource Format="TEX">$K$</EquationSource> </InlineEquation> is a polyhedral convex body. Polyhedrality is a key structural assumption in this paper. Exploiting this property enables a substantial extension of the theory beyond the general non-polyhedral case.</p>

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Diametral Santaló Points of Polyhedral Convex Bodies

  • Alberto Seeger

摘要

Let K $K$ be a convex body in R n $\mathbb{R}^{n}$ . A diametral Santaló point of K $K$ is defined as a minimizer of f K ( u ) : = diam ( ( K u ) ) $\mathfrak{f}_{K}(u):={\mathrm{diam}} ((K-u)^{\circ })$ with respect to u int ( K ) $u \in {\mathrm{int}}(K)$ . The set Φ ( K ) $\Phi (K)$ of diametral Santaló points of K $K$ can be viewed as a sort of central region of K $K$ . The study of this concept of centrality was initiated in a recent work of ours, entitled “Diametral Santaló points of convex bodies” and published in Aequationes Mathematicae. The present work analyzes the function f K $\mathfrak{f}_{K}$ and set Φ ( K ) $\Phi (K)$ under the assumption that K $K$ is a polyhedral convex body. Polyhedrality is a key structural assumption in this paper. Exploiting this property enables a substantial extension of the theory beyond the general non-polyhedral case.