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What does this circled symbol mean?

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- Aug 13th 2009, 06:44 PMchengbinWhat does this domain mean?
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What does this circled symbol mean? - Aug 13th 2009, 06:54 PMpickslides
It means x is an element of the real numbers.

- Aug 13th 2009, 07:04 PMchengbin
How do you type that in latex?

- Aug 13th 2009, 07:20 PMpickslides
Try "x \in R" wrapped in math tags, this will produce

- Aug 13th 2009, 08:11 PMGamma
Generally it should be written in math blackboard font, as $x \in \mathbb{R}$ in LaTeX and it will look like . On these forums you need to wrap in in math tags, like pickslides mentioned.

- Aug 13th 2009, 11:30 PMQM deFuturo
How would you read the entire first line out loud (labeled (3) )?

In the algebra book I'm using, it uses a colon ":" for "such that", whereas here I think the vertical bar is being used as "such that" in the set notation. - Aug 13th 2009, 11:37 PMGamma
"f sends x to the square root of the quantity x+3, where the domain is: The set of all x such that x is greater than or equal to -3, and x is an element of the real numbers."

| and : are both common notations for such that in sets.