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notation - Correct way for writing domain of a function - Mathematics . . . The notation $\ {x \in \mathbb {R} \}$ is a little ambiguous, but would probably be understood As Eike Schulte points out, there is something missing—either the "selection criterion" which tells you how you are choosing element of $\mathbb {R}$, or you are specifying the name and domain of some variable which will be acted on by some
notation - Math Symbol for Where - Mathematics Stack Exchange They are integral parts of larger notations which don't have any individual formal meaning -- the fact that expressing the entire notation in English sometimes involves saying "such that" between the things the symbol stands between in the symbolic form doesn't make those words into a definition of the symbol
Notation for the least common multiple and greatest common divisor The (bad) notation $ (a,b)$ is often used for the greatest common divisor; somebody uses $ [a,b]$ for the lowest common multiple Why are they bad, in particular the former? Because $ (a,b)$ is already used for several other purposes
notation - What are the rules for equals signs with big-O and little-o . . . The interaction between big-O notation and equals signs can be confusing We write things like $$\tag {1} 3n^2+4 = O (n^2)$$ $$\tag {2} 5n^2+7n = O (n^2)$$ But we're not allowed to conclude from these two statements that $3n^2+4=5n^2+7n$