<p>Our work shows that, for any given ideal <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40065_2025_512_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {I}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="script">I</mi> </math></EquationSource> </InlineEquation> on a non empty set <i>X</i>, we can find a topology <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40065_2025_512_Article_IEq2.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="11" /> </InlineMediaObject> <EquationSource Format="TEX">\(\tau \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>τ</mi> </math></EquationSource> </InlineEquation> in which the set of all closed and discrete sets in <i>X</i> coincides with <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40065_2025_512_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {I}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="script">I</mi> </math></EquationSource> </InlineEquation>. We prove that if <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40065_2025_512_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {I}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="script">I</mi> </math></EquationSource> </InlineEquation> is any proper ideal on <i>X</i>, then we can find a topology <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40065_2025_512_Article_IEq5.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="16" /> </InlineMediaObject> <EquationSource Format="TEX">\(\tau ^{\prime }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>τ</mi> <mo>′</mo> </msup> </math></EquationSource> </InlineEquation> in which <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40065_2025_512_Article_IEq5.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="16" /> </InlineMediaObject> <EquationSource Format="TEX">\(\tau ^{\prime }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>τ</mi> <mo>′</mo> </msup> </math></EquationSource> </InlineEquation> makes <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40065_2025_512_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="14" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mathcal {I}\)</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="script">I</mi> </math></EquationSource> </InlineEquation> closed and discrete and <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40065_2025_512_Article_IEq5.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="16" /> </InlineMediaObject> <EquationSource Format="TEX">\(\tau ^{\prime }\)</EquationSource> <EquationSource Format="MATHML"><math> <msup> <mi>τ</mi> <mo>′</mo> </msup> </math></EquationSource> </InlineEquation> is <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40065_2025_512_Article_IEq9.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">\(T_{0}\)</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>T</mi> <mn>0</mn> </msub> </math></EquationSource> </InlineEquation>. Furthermore, we derive some properties of this topology. Finally, we find a compact extension of the newly constructed space.</p>

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Topology making an ideal closed and discrete

  • S. B. Ramkumar,
  • V. Renukadevi

摘要

Our work shows that, for any given ideal \(\mathcal {I}\) I on a non empty set X, we can find a topology \(\tau \) τ in which the set of all closed and discrete sets in X coincides with \(\mathcal {I}\) I . We prove that if \(\mathcal {I}\) I is any proper ideal on X, then we can find a topology \(\tau ^{\prime }\) τ in which \(\tau ^{\prime }\) τ makes \(\mathcal {I}\) I closed and discrete and \(\tau ^{\prime }\) τ is \(T_{0}\) T 0 . Furthermore, we derive some properties of this topology. Finally, we find a compact extension of the newly constructed space.