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In all these pictures, the empty set is missing (-: . Of course you could argue that they’re also missing in Venn diagrams, but it’s common to just point on the

by Jaxan 11mo ago

In all these pictures, the empty set is missing (-: . Of course you could argue that they’re also missing in Venn diagrams, but it’s common to just point on the outside.

amelius 11mo ago
The three lightgray circles in the examples are the empty set.
bmm6o 11mo ago
One example included the empty set, the other did not. It doesn't always make sense to have it.