How i can define a real number xeR?
We'll need more details before we can help. Can you explain the "big picture" problem you're trying to solve? Do you have an example of code you've tried? A desired outcome we can use to test our solutions work?
You can format math expressions on this forum using \LaTeX. Just look up the appropriate markup in the linked document, adapt it to your expression, and wrap it in dollar signs ($). For example, your expression and the markup used:
x \in \mathbb{R}
$x \in \mathbb{R}$
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