Question

What is ℝ in interval notation?

Answer 1

ℝ stands for "all real numbers"
Knowing this, what do you think the interval would be? Hint: It's not a finite interval

Answer 2

(-oo, oo) ?

Answer 3

\[(-\infty,\infty)\]

Answer 4

Yep! So if we say that \(x \in ℝ\), then that means that x is an element of all real numbers! Also note that infinity itself is not exactly a real number, however we can use it to describe the property of a set or interval to indicate that "all real numbers" would go on forever.

Answer 5

Thank you!

Answer 6

You're welcome!