The statement "A union of complements" can be written in set notation as follows:

$X^c \cup Y^c$

This represents the union of the complements of sets $X$ and $Y$. Here, $X^c$ and $Y^c$ are the complements of sets $X$ and $Y$, respectively, and the symbol $\cup$ denotes the union.

Would you like further details or have any questions?

Here are 5 related questions:

1. How would you express the intersection of complements symbolically?
2. What is the complement of the union of $X$ and $Y$?
3. How does De Morgan's Law relate to unions and complements?
4. Can you describe the relationship between $X \cup Y$ and $X^c \cup Y^c$?
5. What does it mean if the complement of $X \cup Y$ equals the complement of $X$?

Tip: De Morgan's Laws are essential when working with unions and intersections of complements. They help simplify expressions involving complements.