题 目：An unawareness operator and the standard state-space models
主讲人：张企教授(台湾清华大学数学系)
时 间：2013年11月4日（星期一）10：30
地 点：主楼418会议室
主讲人简介：
    張企1975年畢業於台灣師範大學數學系，1985年2月獲得美國康乃爾大學應用數學博士。1985年2月至7月在台灣交通大學應用數學系工作，1985年8月起轉至台灣清華大學數學系，主要的研究興趣是合作博奕論、知識博奕論( epistemic game theory)，近幾年對 “unawareness”這個課題投入較多時間。
内容简介：
    Many criteria have been proposed to portray unawareness. To claim a model is able to accommodate unawareness, due to the observation by Dekel, Lipman, and Rustichini(1998 a), it is demanding to require that it should have an operator satisfying all these criteria. The purpose of the paper is to define a notion of unawareness on the standard state-space models which is determined by three essential criteria for the concept: Plausibility, Symmetry, and No positive knowledge proposed by Modica and Rustichini (1994). In fact, U can be defined on non-standard state-space models as well.Moreover, we will discuss whether the notion of unawareness considered is definable in the finitary logic S4.