Remainder for the users who want to help with maintenance of tags - it is good to look from time to time at the list of recently created tags. Just to see whether there are some tags, which should be removed/renamed or where it is unclear whether they are really useful.
negation was created recently. Should we keep it? I'm not sure it will be useful.
Question
Suppose we are dealing with real valued functions $f(x)$ of one real variable $x$. We say that the limit of $f(x)$ at point $a$ exists and equals to $L$ if and only if
$$\exists L:\left( {\forall \varepsilon > 0,\exists \delta > 0:\left( {\forall x,0 < \left| {x - a} \right| < \del...
Question
Suppose we are dealing with real valued functions $f(x)$ of one real variable $x$. We say that the limit of $f(x)$ at point $a$ exists and equals to $L$ if and only if
$$\exists L:\left( {\forall \varepsilon > 0,\exists \delta > 0:\left( {\forall x,0 < \left| {x - a} \right| < \del...
