What is the mathematical meaning of a horizontal A. I mean that it is like this > but crossed which makes it look like a horizontal A.
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Do you mean $\not>$? – Angina Seng Sep 09 '18 at 13:38
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You might get a better response if you include a picture of the item in question. – Peter Phipps Sep 11 '18 at 08:32
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Usually, a slash on symbols in mathematics indicates a negation of the original meaning of the symbol.
For example, \begin{align}=\quad&\to\quad\ne\quad(\text{equality})\\\mid\quad&\to\quad\nmid\quad(\text{divisibility})\\\in\quad&\to\quad\notin\quad(\text{element})\\>\quad&\to\quad\ngtr\quad(\text{greater than})\\<\quad&\to\quad\not\lt\quad(\text{less than})\\\sim\quad&\to\quad\nsim\quad(\text{distribution})\end{align}
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it seems pretty logical indeed and thank you for the answer but it did not look like a slash to me, more like an actual horizontal A with the slash looking more like this | and not going out of the >. I probably am just making my life complicated though, thanks! – mrnobody Sep 10 '18 at 22:17
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$\ngtr$ means not being superior (greater) than something. It is the negation of $>$
PackSciences
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"≥" This means "equal or greater than"
">" This means "greater than" (being equal is not included)
"≯" This means "no greater than" <= What the hey is the difference between this brat and "≤"???
