In his book The Mathematical Universe, mathematician William Dunham wrote of John Venn’s namesake legacy, the Venn diagram, “No one in the long history of mathematics ever became better known ...

Focus on the data in the Venn diagram, not on its appearance. Provide the data in brief statements. Give a summary if one is immediately apparent. Include the caption only if it is not accessible from ...

In set notation this is B = {1, 4, 9}. 30 people answered a survey about whether they have a dog or a cat. The Venn diagram shows the information from the survey. 13 people have got a dog.