What do slanted inequality signs mean? Specifically, these are $\geqslant$, $\leqslant$, $\eqslantgtr$, $\eqslantless$. Is there any place I can look this up? I’ve searched Wikipedia and the web and can’t find anything about them. The last two were found when looking up the first two.
$\geqslant$ is an alternative to $\geq$ and means the same: $a \geqslant b$ = “$a$ is greater than or equal to $b$”.
Likewise, $\leqslant$ is an alternative notation for $\leq$, with $a \leqslant b$ = “$a$ is less than or equal to $b$”.
I haven’t encountered $\eqslantgtr$ or $\eqslantless$, but given that the former is formatted
eqslantgtr and the latter
eqslantless, I would venture to guess that they likewise denote “greater than or equal to” and “less than or equal to”, respectively. Perhaps with these symbols, where the emphasis appears to be on the “equals” component, they are read as “equal to or greater than” and “equal to or less than”, respectively.
In Russia $\geqslant$ and $\leqslant$ are used instead of $\geq$ and $\leq$.
We don’t use $\geq$ and $\leq$ at all.
But I’ve never seen $\eqslantgtr$ and $\eqslantless$ in Russian math texts.
1. There are more interesting distinctions between Russian and English math notations.
For example, we occasionally using $\ n\vdots d\ $ instead of $\ d|n$.
2. There are a lot of strange math symbols exists: see here and here.
I haven’t seen $\eqslantless$ or $\eqslantgtr$ used. A Google search for “eqslantless” turned up
but the actual paper (both the Russian original and the English translation) used $\leqslant$.
In France too, we use $\geqslant$ and $\leqslant$, at least in high school teaching.
The $\geq$ and $\leq$ signs are understandable though, and used by pocket calculators.