
 A Survey of Venn Diagrams: What is a Venn Diagram? 
  Readers interested in the applications of Venn diagrams to logical arguments are referred to the excellent introductory article by Glassner [Gl], the book by Shin [Sh], and many standard logic textbooks. 
  Diagrams exist for all larger values of n as well; there have been several general constructions published (see [Be], [RRS], [Mo], [AC], and [FGK], for a sampling in chronological order); we explain two of them below. 
  Venn's construction, outlined in his original paper [Ve80], is best explained by considering the figure to the right. 
 www.combinatorics.org /Surveys/ds5/VennWhatEJC.html (902 words) 
