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{"title":"关于某些拟Hermitian变种的等价性","authors":"Angela Aguglia, Luca Giuzzi","doi":"10.1002/jcd.21870","DOIUrl":null,"url":null,"abstract":"<p>By Aguglia et al., new quasi-Hermitian varieties <math>\n <semantics>\n <mrow>\n <msub>\n <mi>ℳ</mi>\n <mrow>\n <mi>α</mi>\n <mo>,</mo>\n <mi>β</mi>\n </mrow>\n </msub>\n </mrow>\n <annotation> ${{\\rm{ {\\mathcal M} }}}_{\\alpha ,\\beta }$</annotation>\n </semantics></math> in <math>\n <semantics>\n <mrow>\n <mtext>PG</mtext>\n <mrow>\n <mo>(</mo>\n <mrow>\n <mi>r</mi>\n <mo>,</mo>\n <msup>\n <mi>q</mi>\n <mn>2</mn>\n </msup>\n </mrow>\n <mo>)</mo>\n </mrow>\n </mrow>\n <annotation> $\\text{PG}(r,{q}^{2})$</annotation>\n </semantics></math> depending on a pair of parameters <math>\n <semantics>\n <mrow>\n <mi>α</mi>\n <mo>,</mo>\n <mi>β</mi>\n </mrow>\n <annotation> $\\alpha ,\\beta $</annotation>\n </semantics></math> from the underlying field <math>\n <semantics>\n <mrow>\n <mtext>GF</mtext>\n <mrow>\n <mo>(</mo>\n <msup>\n <mi>q</mi>\n <mn>2</mn>\n </msup>\n <mo>)</mo>\n </mrow>\n </mrow>\n <annotation> $\\text{GF}({q}^{2})$</annotation>\n </semantics></math> have been constructed. In the present paper we study the structure of the lines contained in <math>\n <semantics>\n <mrow>\n <msub>\n <mi>ℳ</mi>\n <mrow>\n <mi>α</mi>\n <mo>,</mo>\n <mi>β</mi>\n </mrow>\n </msub>\n </mrow>\n <annotation> ${{\\rm{ {\\mathcal M} }}}_{\\alpha ,\\beta }$</annotation>\n </semantics></math> and consequently determine the projective equivalence classes of such varieties for <math>\n <semantics>\n <mrow>\n <mi>q</mi>\n </mrow>\n <annotation> $q$</annotation>\n </semantics></math> odd and <math>\n <semantics>\n <mrow>\n <mi>r</mi>\n <mo>=</mo>\n <mn>3</mn>\n </mrow>\n <annotation> $r=3$</annotation>\n </semantics></math>. As a byproduct, we also prove that the collinearity graph of <math>\n <semantics>\n <mrow>\n <msub>\n <mi>ℳ</mi>\n <mrow>\n <mi>α</mi>\n <mo>,</mo>\n <mi>β</mi>\n </mrow>\n </msub>\n </mrow>\n <annotation> ${{\\rm{ {\\mathcal M} }}}_{\\alpha ,\\beta }$</annotation>\n </semantics></math> is connected with diameter 3 for <math>\n <semantics>\n <mrow>\n <mi>q</mi>\n <mo>≡</mo>\n <mn>1</mn>\n <mspace></mspace>\n <mrow>\n <mo>(</mo>\n <mrow>\n <mi>mod</mi>\n <mspace></mspace>\n <mn>4</mn>\n </mrow>\n <mo>)</mo>\n </mrow>\n </mrow>\n <annotation> $q\\equiv 1\\,(\\mathrm{mod}\\,4)$</annotation>\n </semantics></math>.</p>","PeriodicalId":15389,"journal":{"name":"Journal of Combinatorial Designs","volume":"31 2","pages":"124-138"},"PeriodicalIF":0.5000,"publicationDate":"2022-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"On the equivalence of certain quasi-Hermitian varieties\",\"authors\":\"Angela Aguglia, Luca Giuzzi\",\"doi\":\"10.1002/jcd.21870\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>By Aguglia et al., new quasi-Hermitian varieties <math>\\n <semantics>\\n <mrow>\\n <msub>\\n <mi>ℳ</mi>\\n <mrow>\\n <mi>α</mi>\\n <mo>,</mo>\\n <mi>β</mi>\\n </mrow>\\n </msub>\\n </mrow>\\n <annotation> ${{\\\\rm{ {\\\\mathcal M} }}}_{\\\\alpha ,\\\\beta }$</annotation>\\n </semantics></math> in <math>\\n <semantics>\\n <mrow>\\n <mtext>PG</mtext>\\n <mrow>\\n <mo>(</mo>\\n <mrow>\\n <mi>r</mi>\\n <mo>,</mo>\\n <msup>\\n <mi>q</mi>\\n <mn>2</mn>\\n </msup>\\n </mrow>\\n <mo>)</mo>\\n </mrow>\\n </mrow>\\n <annotation> $\\\\text{PG}(r,{q}^{2})$</annotation>\\n </semantics></math> depending on a pair of parameters <math>\\n <semantics>\\n <mrow>\\n <mi>α</mi>\\n <mo>,</mo>\\n <mi>β</mi>\\n </mrow>\\n <annotation> $\\\\alpha ,\\\\beta $</annotation>\\n </semantics></math> from the underlying field <math>\\n <semantics>\\n <mrow>\\n <mtext>GF</mtext>\\n <mrow>\\n <mo>(</mo>\\n <msup>\\n <mi>q</mi>\\n <mn>2</mn>\\n </msup>\\n <mo>)</mo>\\n </mrow>\\n </mrow>\\n <annotation> $\\\\text{GF}({q}^{2})$</annotation>\\n </semantics></math> have been constructed. In the present paper we study the structure of the lines contained in <math>\\n <semantics>\\n <mrow>\\n <msub>\\n <mi>ℳ</mi>\\n <mrow>\\n <mi>α</mi>\\n <mo>,</mo>\\n <mi>β</mi>\\n </mrow>\\n </msub>\\n </mrow>\\n <annotation> ${{\\\\rm{ {\\\\mathcal M} }}}_{\\\\alpha ,\\\\beta }$</annotation>\\n </semantics></math> and consequently determine the projective equivalence classes of such varieties for <math>\\n <semantics>\\n <mrow>\\n <mi>q</mi>\\n </mrow>\\n <annotation> $q$</annotation>\\n </semantics></math> odd and <math>\\n <semantics>\\n <mrow>\\n <mi>r</mi>\\n <mo>=</mo>\\n <mn>3</mn>\\n </mrow>\\n <annotation> $r=3$</annotation>\\n </semantics></math>. As a byproduct, we also prove that the collinearity graph of <math>\\n <semantics>\\n <mrow>\\n <msub>\\n <mi>ℳ</mi>\\n <mrow>\\n <mi>α</mi>\\n <mo>,</mo>\\n <mi>β</mi>\\n </mrow>\\n </msub>\\n </mrow>\\n <annotation> ${{\\\\rm{ {\\\\mathcal M} }}}_{\\\\alpha ,\\\\beta }$</annotation>\\n </semantics></math> is connected with diameter 3 for <math>\\n <semantics>\\n <mrow>\\n <mi>q</mi>\\n <mo>≡</mo>\\n <mn>1</mn>\\n <mspace></mspace>\\n <mrow>\\n <mo>(</mo>\\n <mrow>\\n <mi>mod</mi>\\n <mspace></mspace>\\n <mn>4</mn>\\n </mrow>\\n <mo>)</mo>\\n </mrow>\\n </mrow>\\n <annotation> $q\\\\equiv 1\\\\,(\\\\mathrm{mod}\\\\,4)$</annotation>\\n </semantics></math>.</p>\",\"PeriodicalId\":15389,\"journal\":{\"name\":\"Journal of Combinatorial Designs\",\"volume\":\"31 2\",\"pages\":\"124-138\"},\"PeriodicalIF\":0.5000,\"publicationDate\":\"2022-12-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Combinatorial Designs\",\"FirstCategoryId\":\"100\",\"ListUrlMain\":\"https://onlinelibrary.wiley.com/doi/10.1002/jcd.21870\",\"RegionNum\":4,\"RegionCategory\":\"数学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"MATHEMATICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Combinatorial Designs","FirstCategoryId":"100","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/jcd.21870","RegionNum":4,"RegionCategory":"数学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MATHEMATICS","Score":null,"Total":0}
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