Spherical isometries of finite dimensional C^⁎-algebras

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• 作者：Ryotaro Tanaka¹ ; ^{r-tanaka@math.kyushu-u.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; ^{ryotarotanaka@m.sc.niigata-u.ac.jp" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Isometries ; Unit sphere ; Unitary group ; Faces ; Jordan isomorphisms
• 刊名：Journal of Mathematical Analysis and Applications
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：445
• 期：1
• 页码：337-341
• 全文大小：259 K

文摘

In this paper, it is shown that every surjective isometry between the unit spheres of two finite dimensional n id="mmlsi1" class="mathmlsrc">n class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16303973&_mathId=si1.gif&_user=111111111&_pii=S0022247X16303973&_rdoc=1&_issn=0022247X&md5=ae50bc14f3a8e03c3a1025b443360e0e" title="Click to view the MathML source">C^⁎n>n class="mathContainer hidden">n class="mathCode">$C^{⁎}$n>n>n>-algebras extends to a real-linear Jordan ⁎-isomorphism followed by multiplication operator by a fixed unitary element. This gives an affirmative answer to Tingley's problem between two finite-dimensional n id="mmlsi1" class="mathmlsrc">n class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16303973&_mathId=si1.gif&_user=111111111&_pii=S0022247X16303973&_rdoc=1&_issn=0022247X&md5=ae50bc14f3a8e03c3a1025b443360e0e" title="Click to view the MathML source">C^⁎n>n class="mathContainer hidden">n class="mathCode">$C^{⁎}$n>n>n>-algebras. Moreover, we show that if two finite dimensional n id="mmlsi1" class="mathmlsrc">n class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0022247X16303973&_mathId=si1.gif&_user=111111111&_pii=S0022247X16303973&_rdoc=1&_issn=0022247X&md5=ae50bc14f3a8e03c3a1025b443360e0e" title="Click to view the MathML source">C^⁎n>n class="mathContainer hidden">n class="mathCode">$C^{⁎}$n>n>n>-algebras have isometric unit spheres, then they are ⁎-isomorphic.