Grünbaum's Venn Diagram
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This Demonstration shows Grünbaum's rotationally symmetrical five-set Venn diagram. Drag the locator to select a position in the proposition space. The table then shows whether each of the propositions is true or false.
Contributed by: Izidor Hafner (April 2019)
Open content licensed under CC BY-NC-SA
 F. Ruskey and M. Weston, "A Survey of Venn Diagrams," The Electronic Journal of Combinatorics, DS#5. (Apr 2, 2019) www.combinatorics.org/files/Surveys/ds5/VennEJC.html.
 B. Grünbaum, "The Search for Symmetric Venn Diagrams," Geombinatorics, 8(4), 1999 pp. 104–109. (Mar 27, 2019) sites.math.washington.edu/~grunbaum/SymmetricVennDiagrams.pdf.
 Wikipedia. "Branko Grünbaum." (Mar 27, 2019) en.wikipedia.org/wiki/Branko_Gr%C3%BCnbaum.