<p>For a non-empty locally compact Hausdorff space <i>X</i> and a Dedekind complete normal vector lattice <i>E</i>, we show that the vector lattice of norm to order bounded operators from <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\text {C}_\text {c}(X)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>C</mtext> <mtext>c</mtext> </msub> <mrow> <mo stretchy="false">(</mo> <mi>X</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> or <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\text {C}_0(X)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>C</mtext> <mn>0</mn> </msub> <mrow> <mo stretchy="false">(</mo> <mi>X</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> into <i>E</i> is isomorphic to the vector lattice of <i>E</i>-valued regular Borel measures on <i>X</i>. When <i>E</i> is an order continuous Banach lattice, the isomorphism is an isometric isomorphism between Banach lattices. When <i>X</i> is compact, every regular operator from <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\textrm{C}(X)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>C</mtext> <mo stretchy="false">(</mo> <mi>X</mi> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation> into <i>E</i> is norm to order bounded. For some spaces <i>E</i>, such as KB-spaces or the regular operators on a KB-space, every regular operator from <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\({\mathrm C}_0(X)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mi mathvariant="normal">C</mi> <mn>0</mn> </msub> <mrow> <mo stretchy="false">(</mo> <mi>X</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> into <i>E</i> is norm to order bounded. Additional results are obtained for the whole space of regular operators from <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(\text {C}_\text {c}(X)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>C</mtext> <mtext>c</mtext> </msub> <mrow> <mo stretchy="false">(</mo> <mi>X</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> into an order continuous Banach lattice. As a preparation, vector lattices and Banach lattices, resp. cones, of measures with values in a Dedekind complete vector lattice <i>E</i>, resp. in the extended positive cone of <i>E</i>, are investigated, as well as vector and Banach lattices of norm to order bounded operators. When <i>E</i> is the real numbers, our results specialise to the well-known Riesz representation theorems for the order and norm duals of <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\text {C}_\text {c}(X)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>C</mtext> <mtext>c</mtext> </msub> <mrow> <mo stretchy="false">(</mo> <mi>X</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(\text {C}_0(X)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <msub> <mtext>C</mtext> <mn>0</mn> </msub> <mrow> <mo stretchy="false">(</mo> <mi>X</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>.</p>

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Riesz representation theorems for vector lattices and Banach lattices of regular operators

  • Marcel de Jeu,
  • Xingni Jiang

摘要

For a non-empty locally compact Hausdorff space X and a Dedekind complete normal vector lattice E, we show that the vector lattice of norm to order bounded operators from \(\text {C}_\text {c}(X)\) C c ( X ) or \(\text {C}_0(X)\) C 0 ( X ) into E is isomorphic to the vector lattice of E-valued regular Borel measures on X. When E is an order continuous Banach lattice, the isomorphism is an isometric isomorphism between Banach lattices. When X is compact, every regular operator from \(\textrm{C}(X)\) C ( X ) into E is norm to order bounded. For some spaces E, such as KB-spaces or the regular operators on a KB-space, every regular operator from \({\mathrm C}_0(X)\) C 0 ( X ) into E is norm to order bounded. Additional results are obtained for the whole space of regular operators from \(\text {C}_\text {c}(X)\) C c ( X ) into an order continuous Banach lattice. As a preparation, vector lattices and Banach lattices, resp. cones, of measures with values in a Dedekind complete vector lattice E, resp. in the extended positive cone of E, are investigated, as well as vector and Banach lattices of norm to order bounded operators. When E is the real numbers, our results specialise to the well-known Riesz representation theorems for the order and norm duals of \(\text {C}_\text {c}(X)\) C c ( X ) and \(\text {C}_0(X)\) C 0 ( X ) .