<p>Given separable Hilbert spaces <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq1.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>, <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq2.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal{K}_1\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi mathvariant="script">K</mi> <mn>1</mn> </msub> </math></EquationSource> </InlineEquation>, and <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq3.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="21" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal{K}_2\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi mathvariant="script">K</mi> <mn>2</mn> </msub> </math></EquationSource> </InlineEquation>, we analyze Hilbert-Schmidt frames for <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq1.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> with respect to the tensor product <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq5.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="61" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal{K}_1 \otimes \mathcal{K}_2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="script">K</mi> <mn>1</mn> </msub> <mo>⊗</mo> <msub> <mi mathvariant="script">K</mi> <mn>2</mn> </msub> </mrow> </math></EquationSource> </InlineEquation>. First, we give a characterization of Hilbert-Schmidt frames for <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq1.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> with respect to <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq7.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="61" /> </InlineMediaObject> <EquationSource Format="TEX">\({\mathcal{K}_1 \otimes \mathcal{K}_2}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="script">K</mi> <mn>1</mn> </msub> <mo>⊗</mo> <msub> <mi mathvariant="script">K</mi> <mn>2</mn> </msub> </mrow> </math></EquationSource> </InlineEquation>. The construction of the Hilbert-Schmidt frames for <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq1.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> with respect to <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq5.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="61" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal{K}_1 \otimes \mathcal{K}_2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="script">K</mi> <mn>1</mn> </msub> <mo>⊗</mo> <msub> <mi mathvariant="script">K</mi> <mn>2</mn> </msub> </mrow> </math></EquationSource> </InlineEquation> in terms of discrete frames for <InlineEquation ID="IEq10"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq1.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> is presented. Sufficient conditions for the existence of Hilbert-Schmidt dual frames are given. We give the construction of Hilbert-Schmidt orthonormal bases, and sufficient conditions for the existence of Riesz bases for <InlineEquation ID="IEq11"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq1.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> with respect to <InlineEquation ID="IEq12"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10476_2025_103_Article_IEq5.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="61" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal{K}_1 \otimes \mathcal{K}_2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="script">K</mi> <mn>1</mn> </msub> <mo>⊗</mo> <msub> <mi mathvariant="script">K</mi> <mn>2</mn> </msub> </mrow> </math></EquationSource> </InlineEquation>.</p>

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Hilbert-Schmidt frames and Riesz bases with respect to tensor product of Hilbert spaces

  • Jyoti,
  • L. K. Vashisht

摘要

Given separable Hilbert spaces \(\mathcal{H}\) H , \(\mathcal{K}_1\) K 1 , and \(\mathcal{K}_2\) K 2 , we analyze Hilbert-Schmidt frames for \(\mathcal{H}\) H with respect to the tensor product \(\mathcal{K}_1 \otimes \mathcal{K}_2\) K 1 K 2 . First, we give a characterization of Hilbert-Schmidt frames for \(\mathcal{H}\) H with respect to \({\mathcal{K}_1 \otimes \mathcal{K}_2}\) K 1 K 2 . The construction of the Hilbert-Schmidt frames for \(\mathcal{H}\) H with respect to \(\mathcal{K}_1 \otimes \mathcal{K}_2\) K 1 K 2 in terms of discrete frames for \(\mathcal{H}\) H is presented. Sufficient conditions for the existence of Hilbert-Schmidt dual frames are given. We give the construction of Hilbert-Schmidt orthonormal bases, and sufficient conditions for the existence of Riesz bases for \(\mathcal{H}\) H with respect to \(\mathcal{K}_1 \otimes \mathcal{K}_2\) K 1 K 2 .