THE ELECTRONIC JOURNAL OF COMBINATORICS (ed. June 2005), DS #5. |

An Irreducible Venn Diagram

This is an irreducible diagram derived from the ellipse diagram on the main page. Removing curve 4 results in an independent family in which the region corresponding to the set {1} is disconnected (the cyan shaded region of the figure above). Since the diagram is symmetric, no matter what curve is removed, the result is not a Venn diagram.

THE ELECTRONIC JOURNAL OF COMBINATORICS (ed. June 2005), DS #5. |