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 Apr3 comment How might I read “$\cos\left(\theta\right):\sin\left(\theta\right):1::x:y:r$”? +1 Only this post answers the question. Mar26 comment Why do mathematicians use single-letter variables? @Harry Altman Quark was not invented by physicists, but was taken by Murray Gell-Mann from James Joyce's Finnegan's Wake, in the phrase "Three quarks for Muster Mark!". Mar14 awarded Popular Question Mar10 comment What came first, the $\forall$ or the $\exists$? Isn't E backwards the same as E upside-down regardless of the horizontal symmetry? I prefer to think of both as upside-down letters, as this is how they would have been produced on a printing press. You cannot make any letter backwards with the movable type, but you can place letters upside-down. Jan20 comment British “S-Level” Mathematics Books Brilliant book. My favourite at A-level Dec20 awarded Constituent Dec13 awarded Inquisitive Dec12 revised Brownian motion is almost surely continuous edited tags Dec12 asked Brownian motion is almost surely continuous Dec8 awarded Caucus Dec8 answered How to google search mathematical notions and expressions? Nov23 awarded Nice Question Nov21 awarded Yearling Nov1 answered Use of the word “shall” in mathematical writing Oct31 awarded Organizer Oct31 revised Is a linear transformation just a mathematical description of a straight line? improved formatting Oct31 suggested approved edit on Is a linear transformation just a mathematical description of a straight line? Oct29 comment Multiple integral differential notation Thanks for your answer, I know that the $d^3 x$ stands for the volume in all these various coordinate systems, I just chose dimension 3 as an example really. From your answer I can see that you are saying $d^n x$ has nothing to do with higher-order differentials. But I would be interested to know where this comes from and who originally suggested this notation as it is easy to confuse with a higher-order differential. Oct29 revised Multiple integral differential notation edited tags Oct29 revised Multiple integral differential notation added 108 characters in body