Notice you don’t use capitals within the brackets. A Venn diagram begins with a box called our universal set, which is denoted by the symbol \(ε\) (epsilon). The universal set contains ...

It's possible a Venn diagram can have three (or more ... The full list of pupils forms the universal set U {thomas, sean, chris, sarah, freya, sophie, noah, melanie, jayne, carrie, alex} ...