T
HE
E
LECTRONIC
J
OURNAL OF
C
OMBINATORICS
(ed. June 2005), DS #5.
Venn Diagram Survey
Minimum Vertex Symmetric 7Venn Diagrams
[
polar

nonpolar
]
Polar Symmetric
Shown below is a minimum vertex polar symmetric Venn diagram for
n
= 7; it was discovered by Stirling Chow and Frank Ruskey [
CR98
]. The first diagram has a single curve highlighted.
The same diagram, with all curves colored:
Nonpolar Symmetric
This diagram is a minimum vertex
non
polar symmetric diagram for
n
=7. With a single curve coloured:
All curves colored:
T
HE
E
LECTRONIC
J
OURNAL OF
C
OMBINATORICS
(ed. June 2005), DS #5.