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Is this notation correct? I am not sure about the brackets.

$x^2=4$

$x=\{-2,2\}$

Thanks in advance.

rae306
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    $x\in{-2,2}$ is more appropriate, since you're saying that $x$ is one of those two numbers rather than saying that $x$ itself is the set. – Semiclassical Sep 02 '14 at 17:37
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    I suggest $x=\pm 2$, or $x=2,-2$. I don't think there is anything wrong with the brackets but it is not common – graydad Sep 02 '14 at 17:37
  • When you write ${x>|>x^2=4}$ it is not obvious what the intended "universe" is. E.g., ${x\in{\mathbb N}>|>x^2=4}={2}$. – Christian Blatter Sep 02 '14 at 17:42

1 Answers1

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What you need to denote is $$x \in \{-2, 2\}$$

That is, you want to convey that $x$ is an element of the solution set $\{-2, 2\}$. $x$ is not equal to the set.

So simply replace the symbol "$=$" with the symbol "$\in$", and all is then good.

amWhy
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