Chapter 1 - Section 1.6 - Relationships: Perpendicular Lines - Exercises: 20b

U denotes a $union$ of two or more sets.

Work Step by Step

A $U$, where $a$ and $b$ are sets (a collection of items), is every item included in set $a$ or set $b$ with no repetition. You can call this the "$union$" of $a$ and $b$. Generally, U denotes union.

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