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In his famous paper How to write mathematics, P.R. Halmos says the following about "where". "Where" is usually a sign of a lazy afterthought that should ... ... <看更多>

Math symbols in English - ESLBuzz Learning English. Mathematics is used to communicate information about a wide range of different subjects... ... <看更多>

That's the "forall" (for all) symbol, as seen in Wikipedia's table of mathematical symbols or the Unicode forall character ( \u2200 , ∀). ... <看更多>