weak unit

Let E be an Archimedean Riesz algebra possessing a weak unit element e and a maximal disjoint system {e,: i∈I} in which e, is a projection element for each i.

设E是具有弱单位元素e的ArchimedeanRiesz代数，｛ei∶∈I｝是一个极大不相交系，其中每一个ei都是投影元素。