Sets - Relative Complement

Complement (Relative), denoted $\backslash$ , refers to the elements in the first set, but are not in the second set.

In symbols, for set $A$ and $B$ , $A \backslash B = \{ x | x \in A \wedge x \notin B\}$

Venn Diagram Sets Venn Diagram Sets

In the example, $H\backslash T = \{ c, f \}$ .