The classic two-set Venn diagram consists of two circles, but you can compare ... who wrote a paper in 1880 entitled "On the Diagrammatic and Mechanical Representation of Propositions and Reasonings." ...

Their compact representation of group relationships ... Typical two- and three-circle Venn diagrams share this property. Rotate a two-circle Venn diagram by 180 degrees (or a three-circle one ...

These overlapping circles are known as Venn diagrams and are celebrated Monday ... in a paper called "On the Diagrammatic and Mechanical Representation of Propositions and Reasonings," and the ...