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Math Help - The [tex]\in[/tex] symbol

  1. #1
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    The [tex]\in[/tex] symbol

    I'm reading my calc chapters and I don't know what this sign means. I thought I post it in the pre-algebra & algebra section because the symbol has nothing to do with calc.

    So I was wondering what the symbol is called and what it means. Here it is: \in

    It is used in context like this: The Cartesian product \Re x \Re x \Re = { (x, y, z) | z, y, z \in \Re } is the set of all ordered triples of real numbers and is denoted by \Re^3
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  2. #2
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    Quote Originally Posted by lilaziz1 View Post
    I'm reading my calc chapters and I don't know what this sign means. I thought I post it in the pre-algebra & algebra section because the symbol has nothing to do with calc.

    So I was wondering what the symbol is called and what it means. Here it is: \in

    It is used in context like this: The Cartesian product \Re x \Re x \Re = { (x, y, z) | z, y, z \in \Re } is the set of all ordered triples of real numbers and is denoted by \Re^3
    It means 'is an element of'.
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  3. #3
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    Or, less formally, it means "in".

    So x \in \mathbf{R} means " x is an element of the Real Numbers", or " x is in the set of Real Numbers", or " x is a Real Number"...
    Last edited by Prove It; September 4th 2010 at 12:14 AM.
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