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In his Arithmetices Principia Novo Methodo Exposita (1889) [see this post Giuseppe Peano used an $\text {"inverted C"}$ for set inclusion (modern : $\subset$).
There is a way to "invert" the alphabetic letters in formulae ?
$\begingroup$So Peano used $a \supset b$ to say "$a$ is contained in $b$", if I understand correctly? (That's confusing :/) Anyway, the command is \supset.$\endgroup$
– Najib IdrissiApr 27 '15 at 11:15
$\begingroup$@NajibIdrissi - Thanks, but I know it ... In order to convey the "historical" aspect of the old symbols, I'm asking for a way to "ivert" (right-to-left) - if possible - some alphabetic symbols, like $C$ and $D$, used in that way by Peano and Russell ... :)$\endgroup$
– Mauro ALLEGRANZAApr 27 '15 at 11:29
1
$\begingroup$Ah, you literally want the symbol $C$ but flipped horizontally, without any other modifications? It's possible in latex (with \reflectbox), but I don't know if it is in mathjax. \reflectbox doesn't exist at least.$\endgroup$
– Najib IdrissiApr 27 '15 at 11:31
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\supset
. $\endgroup$ – Najib Idrissi Apr 27 '15 at 11:15\reflectbox
), but I don't know if it is in mathjax.\reflectbox
doesn't exist at least. $\endgroup$ – Najib Idrissi Apr 27 '15 at 11:31