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Math Help - What does this domain mean?

  1. #1
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    What does this domain mean?



    What does this circled symbol mean?
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  2. #2
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    It means x is an element of the real numbers.
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  3. #3
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    How do you type that in latex?
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  4. #4
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    Try "x \in R" wrapped in math tags, this will produce  x \in R
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  5. #5
    Super Member Gamma's Avatar
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    Generally it should be written in math blackboard font, as $x \in \mathbb{R}$ in LaTeX and it will look like x\in \mathbb{R}. On these forums you need to wrap in in math tags, like pickslides mentioned.
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  6. #6
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    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.
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  7. #7
    Super Member Gamma's Avatar
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    "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.
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