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notation - What does := mean? - Mathematics Stack Exchange It's curious --and unfortunate-- that the symbol for emphasis became the symbol for negation Granted, ASCII isn't the richest glyph set, and coders needed something, but why settle on the symbol that means in prose the exact opposite of what it means in code? Irony?
Difference between ≈, ≃, and ≅ - Mathematics Stack Exchange The symbol ≅ is used for isomorphism of objects of a category, and in particular for isomorphism of categories (which are objects of CAT) The symbol ≃ is used for equivalence of categories At least, this is the convention used in this book and by most category theorists, although it is far from universal in mathematics at large
Symbol for “such that” (not in set) - Mathematics Stack Exchange Nobody should be using $\ni$ to mean "such that"; it is used in texts everywhere to mean $\in$ but in the reverse direction (that's why the LaTeX code is "\ni" after all) I would argue ":" is the superior notation for set-building since (in most handwriting) it is the least likely to be confused with anything else (I, l, 1), hence being the most readable
such that logical symbol - Mathematics Stack Exchange In set theory \mid or : is often used but I haven't really seen any logical symbol used for "such that" in other situations But now that I think of it there is the \ni symbol used as "such that" in mathematical logic I believe
Yellowjackets Explained: The Mystery of the Symbol and How the . . . - Reddit There is a common thread running through many of the mysteries and hints in the series—the mysterious symbol, (alleged) astronomical symbols, cannibalism, and the sign of the bird and water symbolism in Episode 8 This thread also runs through questions with seemingly obvious answers, especially, “Why is the series called Yellowjackets?” It all boils down to trigonometry, occultations