What does the double vertical lines in the domain of a function mean?

Question

In my math textbook there was a question to sketch a possible graph in which it gave me some information on it. One of the questions gave me the domain and range of the function. The domain was [-5,||) and the range was [0,||). What does the double vertical lines mean here? Thanks!

Here is the picture:

Are you sure it's not $11$? :P More seriously, I've never seen this notation before. It's likely defined earlier in the book. — Matt Samuel, Jan 28 '16 at 00:42
I am sure it is not 11 and also sure you are not supposed to fill in the blank but thanks! — Justin Lam, Jan 28 '16 at 02:58
Can you give us more context? What is the function being talked about? Can you show the whole page? — JRN, Jan 28 '16 at 05:59

score 1 · Answer 1 · answered Jan 28 '16 at 01:12

1

I suspect the symbol was meant to be $\infty$ (infinity) but was printed incorrectly. If so, then the domain is $\{x:x\ge -5\}$ and the range is $\{y:y\ge 0\}$.

answered Jan 28 '16 at 01:12

JRN

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What does the double vertical lines in the domain of a function mean?

1 Answers1