<p>Let <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2025_1849_Article_IEq1.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="87" /> </InlineMediaObject> <EquationSource Format="TEX">\(\tilde{A}=(A_{t})_{t\in T}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mover accent="true"> <mi>A</mi> <mo stretchy="false">~</mo> </mover> <mo>=</mo> <msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi>A</mi> <mi>t</mi> </msub> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>t</mi> <mo>∈</mo> <mi>T</mi> </mrow> </msub> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2025_1849_Article_IEq2.gif" Format="GIF" Height="22" Rendition="HTML" Resolution="72" Type="Linedraw" Width="88" /> </InlineMediaObject> <EquationSource Format="TEX">\(\tilde{B}=(B_{t})_{t\in T}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mover accent="true"> <mi>B</mi> <mo stretchy="false">~</mo> </mover> <mo>=</mo> <msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi>B</mi> <mi>t</mi> </msub> <mo stretchy="false">)</mo> </mrow> <mrow> <mi>t</mi> <mo>∈</mo> <mi>T</mi> </mrow> </msub> </mrow> </math></EquationSource> </InlineEquation> be two continuous fields of strictly positive operators on a Hilbert space <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2025_1849_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {H}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="script">H</mi> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2025_1849_Article_IEq4.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="107" /> </InlineMediaObject> <EquationSource Format="TEX">\(f:[0,\infty )\rightarrow \mathbb {R}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>f</mi> <mo>:</mo> <mo stretchy="false">[</mo> <mn>0</mn> <mo>,</mo> <mi>∞</mi> <mo stretchy="false">)</mo> <mo stretchy="false">→</mo> <mi mathvariant="double-struck">R</mi> </mrow> </math></EquationSource> </InlineEquation> a continuous function. We introduce the notion of noncommutative <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2025_1849_Article_IEq5.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(\lambda \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>λ</mi> </math></EquationSource> </InlineEquation>-perspective with <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2025_1849_Article_IEq6.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="65" /> </InlineMediaObject> <EquationSource Format="TEX">\(\lambda \in \left[ 0,1\right] \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>λ</mi> <mo>∈</mo> <mfenced close="]" open="["> <mn>0</mn> <mo>,</mo> <mn>1</mn> </mfenced> </mrow> </math></EquationSource> </InlineEquation> and the Csiszár <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2025_1849_Article_IEq7.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="41" /> </InlineMediaObject> <EquationSource Format="TEX">\((f,\lambda )\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo stretchy="false">(</mo> <mi>f</mi> <mo>,</mo> <mi>λ</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>-divergence operator mapping by setting <Equation ID="Equ50"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2025_1849_Article_Equ50.gif" Format="GIF" Height="25" Rendition="HTML" Resolution="72" Type="Linedraw" Width="360" /> </MediaObject> <EquationSource Format="TEX">\(\begin{aligned} P_{f,\lambda }(A_{t},B_{t}):=A_{t}^{1/2}f(\lambda A_{t}^{-1/2}B_{t}A_{t}^{-1/2}+1-\lambda )A_{t}^{1/2} \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <msub> <mi>P</mi> <mrow> <mi>f</mi> <mo>,</mo> <mi>λ</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi>A</mi> <mi>t</mi> </msub> <mo>,</mo> <msub> <mi>B</mi> <mi>t</mi> </msub> <mo stretchy="false">)</mo> </mrow> <mo>:</mo> <mo>=</mo> <msubsup> <mi>A</mi> <mrow> <mi>t</mi> </mrow> <mrow> <mn>1</mn> <mo stretchy="false">/</mo> <mn>2</mn> </mrow> </msubsup> <mi>f</mi> <mrow> <mo stretchy="false">(</mo> <mi>λ</mi> <msubsup> <mi>A</mi> <mrow> <mi>t</mi> </mrow> <mrow> <mo>-</mo> <mn>1</mn> <mo stretchy="false">/</mo> <mn>2</mn> </mrow> </msubsup> <msub> <mi>B</mi> <mi>t</mi> </msub> <msubsup> <mi>A</mi> <mrow> <mi>t</mi> </mrow> <mrow> <mo>-</mo> <mn>1</mn> <mo stretchy="false">/</mo> <mn>2</mn> </mrow> </msubsup> <mo>+</mo> <mn>1</mn> <mo>-</mo> <mi>λ</mi> <mo stretchy="false">)</mo> </mrow> <msubsup> <mi>A</mi> <mrow> <mi>t</mi> </mrow> <mrow> <mn>1</mn> <mo stretchy="false">/</mo> <mn>2</mn> </mrow> </msubsup> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>and <Equation ID="Equ51"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2025_1849_Article_Equ51.gif" Format="GIF" Height="41" Rendition="HTML" Resolution="72" Type="Linedraw" Width="240" /> </MediaObject> <EquationSource Format="TEX">\(\begin{aligned} \textbf{I}_{f,\lambda }(\tilde{A},\tilde{B})=\int _{T}P_{f,\lambda }(A_{t},B_{t})d\mu (t), \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <msub> <mi mathvariant="bold">I</mi> <mrow> <mi>f</mi> <mo>,</mo> <mi>λ</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <mover accent="true"> <mi>A</mi> <mo stretchy="false">~</mo> </mover> <mo>,</mo> <mover accent="true"> <mi>B</mi> <mo stretchy="false">~</mo> </mover> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <msub> <mo>∫</mo> <mi>T</mi> </msub> <msub> <mi>P</mi> <mrow> <mi>f</mi> <mo>,</mo> <mi>λ</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi>A</mi> <mi>t</mi> </msub> <mo>,</mo> <msub> <mi>B</mi> <mi>t</mi> </msub> <mo stretchy="false">)</mo> </mrow> <mi>d</mi> <mi>μ</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> </mrow> <mo>,</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>respectively. We also consider the (HH)-<i>f</i>-divergence operator mapping by setting <Equation ID="Equ52"> <MediaObject> <ImageObject Color="BlackWhite" FileRef="11785_2025_1849_Article_Equ52.gif" Format="GIF" Height="44" Rendition="HTML" Resolution="72" Type="Linedraw" Width="289" /> </MediaObject> <EquationSource Format="TEX">\(\begin{aligned} \textbf{I}_{HH}^{f}(\tilde{A},\tilde{B})=\int _{0}^{1}\int _{T}P_{f,\lambda }(A_{t},B_{t})d\mu (t)d\lambda . \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <msubsup> <mi mathvariant="bold">I</mi> <mrow> <mi mathvariant="italic">HH</mi> </mrow> <mi>f</mi> </msubsup> <mrow> <mo stretchy="false">(</mo> <mover accent="true"> <mi>A</mi> <mo stretchy="false">~</mo> </mover> <mo>,</mo> <mover accent="true"> <mi>B</mi> <mo stretchy="false">~</mo> </mover> <mo stretchy="false">)</mo> </mrow> <mo>=</mo> <msubsup> <mo>∫</mo> <mrow> <mn>0</mn> </mrow> <mn>1</mn> </msubsup> <msub> <mo>∫</mo> <mi>T</mi> </msub> <msub> <mi>P</mi> <mrow> <mi>f</mi> <mo>,</mo> <mi>λ</mi> </mrow> </msub> <mrow> <mo stretchy="false">(</mo> <msub> <mi>A</mi> <mi>t</mi> </msub> <mo>,</mo> <msub> <mi>B</mi> <mi>t</mi> </msub> <mo stretchy="false">)</mo> </mrow> <mi>d</mi> <mi>μ</mi> <mrow> <mo stretchy="false">(</mo> <mi>t</mi> <mo stretchy="false">)</mo> </mrow> <mi>d</mi> <mi>λ</mi> <mo>.</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>In this paper, we investigate some fundamental properties of (HH)-<i>f</i>-divergence operator. Some upper and lower bounds of interest are also provided.</p>

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Hermite-Hadamard f-Divergence Operator Mapping

  • Silvestru Sever Dragomir,
  • Ismail Nikoufar

摘要

Let \(\tilde{A}=(A_{t})_{t\in T}\) A ~ = ( A t ) t T and \(\tilde{B}=(B_{t})_{t\in T}\) B ~ = ( B t ) t T be two continuous fields of strictly positive operators on a Hilbert space \(\mathcal {H}\) H and \(f:[0,\infty )\rightarrow \mathbb {R}\) f : [ 0 , ) R a continuous function. We introduce the notion of noncommutative \(\lambda \) λ -perspective with \(\lambda \in \left[ 0,1\right] \) λ 0 , 1 and the Csiszár \((f,\lambda )\) ( f , λ ) -divergence operator mapping by setting \(\begin{aligned} P_{f,\lambda }(A_{t},B_{t}):=A_{t}^{1/2}f(\lambda A_{t}^{-1/2}B_{t}A_{t}^{-1/2}+1-\lambda )A_{t}^{1/2} \end{aligned}\) P f , λ ( A t , B t ) : = A t 1 / 2 f ( λ A t - 1 / 2 B t A t - 1 / 2 + 1 - λ ) A t 1 / 2 and \(\begin{aligned} \textbf{I}_{f,\lambda }(\tilde{A},\tilde{B})=\int _{T}P_{f,\lambda }(A_{t},B_{t})d\mu (t), \end{aligned}\) I f , λ ( A ~ , B ~ ) = T P f , λ ( A t , B t ) d μ ( t ) , respectively. We also consider the (HH)-f-divergence operator mapping by setting \(\begin{aligned} \textbf{I}_{HH}^{f}(\tilde{A},\tilde{B})=\int _{0}^{1}\int _{T}P_{f,\lambda }(A_{t},B_{t})d\mu (t)d\lambda . \end{aligned}\) I HH f ( A ~ , B ~ ) = 0 1 T P f , λ ( A t , B t ) d μ ( t ) d λ . In this paper, we investigate some fundamental properties of (HH)-f-divergence operator. Some upper and lower bounds of interest are also provided.