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25m
revised Extending functions from $(a,b)$ to $[a,b]$.
edited tags
2h
revised prove that $\exists\ \epsilon>0$ such that $\forall x\in [0,1] : f(x)>x+\epsilon$
TeX: \lim; edited tags
4h
awarded  Enlightened
5h
awarded  Nice Answer
6h
revised Let $X=\{0,1\}$ be equipped with the indiscrete topology; Why is every $f:Y \to X$ continuous?
minor typos
11h
revised Math-english for non-natives: What does “supported in” mean?
edited body
11h
revised Math-english for non-natives: What does “supported in” mean?
edited tags
12h
revised Maximum of function containing two variables $x$ and $y$
added (max-min) tag
12h
comment Show that a differentiable function $f:\mathbb{R} \to \mathbb{R}$ has a global max in $a$ if $a$ is its local max
I think that adding an exact reference rather than saying "my book" would also improve the question. (Not to mention that the phrase my book is somewhat ambiguous. It might mean a book your studying or a book you wrote.)
12h
comment Show that a differentiable function $f:\mathbb{R} \to \mathbb{R}$ has a global max in $a$ if $a$ is its local max
Did you want to write differentiable function rather than differential function?
12h
revised Show that a differentiable function $f:\mathbb{R} \to \mathbb{R}$ has a global max in $a$ if $a$ is its local max
added (max-min) tag
12h
comment Prove that $(H,\circ)$ is a subgroup of the group $(G, \circ)$
@TobiasKildetoft You're probably right. I have removed the tag.
12h
revised Prove that $(H,\circ)$ is a subgroup of the group $(G, \circ)$
rolled back to a previous revision
12h
revised For a group $G$ and subgroup $H$, is $a \sim b \iff a^{-1}b\in H$ an equivalence relation even when $H$ is not normal?
edited tags
12h
revised Prove that $(H,\circ)$ is a subgroup of the group $(G, \circ)$
edited tags
13h
revised mean time question
added 2 characters in body; edited title
13h
comment Find the limit of $\frac{(n+1)^\sqrt{n+1}}{n^\sqrt{n}}$.
To see that $\left(\sqrt{n+1}^{\frac1{\sqrt{n+1}}}\right)^2 \to 0$ we can apply $\lim\limits_{n\to\infty} n^{1/n} =1$, right? Or, more precisely, $\lim\limits_{x\to\infty} x^{1/x} =1$. (This was shown here and in many other posts.) Or is there something more straightforward?
13h
revised Solving without induction show that $a_{n}=2n-1$
added 1 character in body
15h
revised Why the number e(=2.71828) was chosen as the natural base for logarithm functions?
added (e) tag
15h
revised What's so “natural” about the base of natural logarithms?
added (e) tag