How to write the big Xi symbol in MathJax?
$\Xi$, not as I wanted. In the video, he said that it is the awful notation in Mathematics and called it Xi. After searching about the notation in internet I got nothing.
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This question has been addressed elsewhere.
This question is not within the scope of Mathematics.
This question cannot be answered in its current form, because critical information is missing.
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This question cannot be answered in a way that is helpful to anyone. It's not possible to learn something from possible answers, except for the solution for the specific problem of the asker.
The handwritten text that you show is not Xi, it is Xi divided by overline Xi (as shown in Peter Taylor's answer).
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