5
$\begingroup$

ProofWiki

What does the upside-down A on this page mean?

$$\forall a,b\in S: a\circ x=b\circ x \implies a=b$$

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    It means : "for all"2012-12-11
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    This means for all choices of $a$ and $b$ in $S$. You should read $\forall$ as "for all"2012-12-11
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    One resource I have found exceedingly useful in determining the meaning of symbols in math texts (especially when I'm teaching myself) is the wiki page on math symbols: http://en.wikipedia.org/wiki/List_of_mathematical_symbols2012-12-11

2 Answers 2