The numbers are coloured orange., Draw a Venn diagram for ξ = {positive whole numbers less than 10}, A = {prime numbers} and B = {even numbers}. Write each set as a list of elements.

Henderson only showed that a prime number of sets is necessary, not that you can always design a symmetric Venn diagram for every prime number. Thus began a contest to find larger and larger examples.

If you think Venn diagrams are just a bunch of interlocking circles, ... Grünbaum and Edwards independently discovered this symmetrical Venn diagram for seven sets, the next prime number.

A new rose has blossomed in the garden of mathematics: a flowery Venn diagram for 11 sets of objects. Venn diagrams use overlapping circles to show all possible relationships between sets ...

Venn used the diagrams to prove a form of logical statement known as a categorical syllogism. This can be used to model reasoning. Here’s an example: “All computers need power.