\exists gives you the flipped E, but what is the command for the negated symbol?
\times is the cross product command in LaTeX.
LaTeX provides almost any mathematical or technical symbol that anyone uses. For example, if you include $\pi$ in your source, you will get the pi symbol π.
The command for the negative existential quantifier is \nexists
. However, I believe you should ask questions like this on the TeX site of Stack Exchange.
This is a great site that lets you draw the symbol you want, and it shows a list of possible latex commands. \nexists
was the first suggestion that popped up! http://detexify.kirelabs.org/classify.html
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