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Home >> Seminar

Semigroup C*-algebras and toric varieties

Prof. Joachim Cuntz(约阿希姆 孔茨教授)
Friday, March 31st, 2017, 3:00 PM  理科大楼A1510室
 
报告人简介:
Joachim Cuntz教授是国际著名算子代数和非交换几何专家。他是单C*-代数分类理论的开创者之一,提出了包括Cuntz半群和Cuntz代数在内的全新方法和重要例子。他和Daniel Quillen一起,发展了循环上同调的新方法,并证明了周期循环理论的切割性质。在近些年里,他在数论相关的C*-代数研究中有重大突破。Cuntz教授的重要研究成果发表在《Ann. of Math.》、《Invent. Math.》、《J. Amer. Math. Soc.》等国际顶级数学期刊上。 由于其杰出的学术成就,Cuntz教授受邀于1990年在国际数学家大会(ICM)上做45分钟报告,2012年当选美国数学会首届会士,是公认的领域内领军人物。

报告内容简介:
The coordinate ring of a toric variety is the semigroup ring of a finitely generated subsemigroup of Zn. Such semigroups have the interesting feature that their family of constructible ideals is not independent. This is reflected by torsion phenomena in the K-theory of the semigroup C*-algebra. We give a complete formula for the K-theory in the case of subsemigroups of Z2

主办单位:数学系 科技处

主持人:林华新 教授
   
 
 
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