<p>In [<CitationRef CitationID="CR18">18</CitationRef>], the authors introduced the space of scalar-valued functions <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1063_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="70" /> </InlineMediaObject> <EquationSource Format="TEX">\(GBV_\star (A)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>G</mi> <mi>B</mi> <msub> <mi>V</mi> <mo>⋆</mo> </msub> <mrow> <mo stretchy="false">(</mo> <mi>A</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> to minimise a class of functionals whose study is motivated by fracture mechanics. In this paper, we extend the definition of <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1063_Article_IEq1.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="70" /> </InlineMediaObject> <EquationSource Format="TEX">\(GBV_\star (A)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>G</mi> <mi>B</mi> <msub> <mi>V</mi> <mo>⋆</mo> </msub> <mrow> <mo stretchy="false">(</mo> <mi>A</mi> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> to the vectorial case, introducing the space <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1063_Article_IEq3.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="94" /> </InlineMediaObject> <EquationSource Format="TEX">\(GBV_\star (A;{{\mathbb {R}}}^k)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>G</mi> <mi>B</mi> <msub> <mi>V</mi> <mo>⋆</mo> </msub> <mrow> <mo stretchy="false">(</mo> <mi>A</mi> <mo>;</mo> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mi>k</mi> </msup> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation>. We study the main properties of <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1063_Article_IEq3.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="94" /> </InlineMediaObject> <EquationSource Format="TEX">\(GBV_\star (A;{{\mathbb {R}}}^k)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>G</mi> <mi>B</mi> <msub> <mi>V</mi> <mo>⋆</mo> </msub> <mrow> <mo stretchy="false">(</mo> <mi>A</mi> <mo>;</mo> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mi>k</mi> </msup> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> and prove a lower semicontinuity result useful for minimisation purposes. With the Direct Method in mind, we adapt the arguments of [<CitationRef CitationID="CR18">18</CitationRef>] to show that minimising sequences in <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1063_Article_IEq3.gif" Format="GIF" Height="21" Rendition="HTML" Resolution="72" Type="Linedraw" Width="94" /> </InlineMediaObject> <EquationSource Format="TEX">\(GBV_\star (A;{{\mathbb {R}}}^k)\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>G</mi> <mi>B</mi> <msub> <mi>V</mi> <mo>⋆</mo> </msub> <mrow> <mo stretchy="false">(</mo> <mi>A</mi> <mo>;</mo> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mi>k</mi> </msup> <mo stretchy="false">)</mo> </mrow> </mrow> </math></EquationSource> </InlineEquation> can be modified to obtain a minimising sequence converging <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1063_Article_IEq6.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="22" /> </InlineMediaObject> <EquationSource Format="TEX">\({\mathcal {L}}^d\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mrow> <mi mathvariant="script">L</mi> </mrow> <mi>d</mi> </msup> </math></EquationSource> </InlineEquation>-a.e in <i>A</i>.</p>

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A new space of generalised vector-valued functions of bounded variation

  • Davide Donati

摘要

In [18], the authors introduced the space of scalar-valued functions \(GBV_\star (A)\) G B V ( A ) to minimise a class of functionals whose study is motivated by fracture mechanics. In this paper, we extend the definition of \(GBV_\star (A)\) G B V ( A ) to the vectorial case, introducing the space \(GBV_\star (A;{{\mathbb {R}}}^k)\) G B V ( A ; R k ) . We study the main properties of \(GBV_\star (A;{{\mathbb {R}}}^k)\) G B V ( A ; R k ) and prove a lower semicontinuity result useful for minimisation purposes. With the Direct Method in mind, we adapt the arguments of [18] to show that minimising sequences in \(GBV_\star (A;{{\mathbb {R}}}^k)\) G B V ( A ; R k ) can be modified to obtain a minimising sequence converging \({\mathcal {L}}^d\) L d -a.e in A.