Ashkenazi haredim attacked the government again this week for trying to force them to teach their children foreign "Greek mathematics," thereby causing haredi children to learn less Jewish Torah. The attack is on the math itself, not just on teaching it. But Elijah ben Shlomo Zalman Kremer, the Gaon of Vilna – the 'patriarch' of much of the United Torah Judaism political party that published the anti-math ad – himself wrote a mathematics book. Here's the cover page…